Waldemar Tully (von) Oxholm (11 November 1805 – 3 August 1876) was a Danish nobleman, diplomat, and senior court official. He served as Lord Marshal of the Court under Christian IX from 1863 until his death, and although never in executive office, he is regarded as an influential intermediary in Denmark's transition from absolutism to constitutional monarchy, particularly during the political crises of 1848 and 1863.

Born in Copenhagen, the son of Governor-General Peter Lotharius Oxholm and Ann O’Neill, he was educated at Herlufsholm School and the University of Copenhagen. He joined the Foot Guards in 1821 and spent the following decade in the Danish West Indies, where he assisted in managing his family's plantations on Saint Croix and served as adjutant to Governor-General Peter von Scholten. Returning to Copenhagen in 1834, he assisted Scholten in government deliberations on the abolition of slavery, and was that year appointed tutor to Prince Christian of Glücksburg (later Christian IX), whom he accompanied to the University of Bonn, where a lifelong relationship of trust was established.

After his return to Denmark, Oxholm entered court service as chamberlain (1840) and later chief of the Crown Prince Frederick's household (1842–1847). During the March Revolution of 1848 he mediated between King Frederick VII, Count Adam Wilhelm Moltke, and the National Liberal leaders in forming the March Ministry, subsequently sitting in the Danish Constituent Assembly (1848–1849) and the Landsting (1849–1853). At the outset of the First Schleswig War, he was sent on diplomatic missions to St Petersburg, Stockholm, and London, and served as Danish minister to Britain from 1854 to 1857.

In 1863 Oxholm accompanied Prince Christian and Princess Louise to London for the marriage of Princess Alexandra to the Prince of Wales, where he transmitted the British proposal that Prince William of Denmark should be elected King of Greece. Following Christian IX's accession in November 1863, Oxholm was appointed Lord Marshal of the Court (), becoming chief officer of the royal household and principal adviser to the new king. During the constitutional crisis of December 1863, when the recently enacted November Constitution provoked international opposition and the threat of war with Prussia and Austria, he coordinated communication between the crown and the government. Regarded by the National Liberals with suspicion but respected in conservative circles for his loyalty and integrity, he remained one of Christian IX's most trusted advisers until his death at Smidstrup near Vedbæk, aged 70, on 3 August 1876.

Early life and education Waldemar (Valdemar) Tully Oxholm was born on 11 November 1805 in Copenhagen, the son of Peter Lotharius Oxholm, later lieutenant general, governor-general of the Danish West Indies, and proprietor of extensive plantations on Saint Croix, and of his second wife Ann O’Neill, daughter of a plantation owner on St. Croix.

After private tuition, he entered the classical school at Herlufsholm aged 11, and was matriculated to the University of Copenhagen in 1820. The following year he passed the examen philosophicum, passed an officer's examination, and received a commission as second lieutenant à la suite in the Foot Guards. By 1824 he held the court rank of kammerjunker (gentleman of the bedchamber).

Family obligations soon led him overseas. In 1822, he obtained leave from the army to assist his father in the management of his extensive plantations on Saint Croix. Although he periodically returned to Denmark for military duty, the following decade was largely spent between Copenhagen and the Danish West Indies, alternating service at court and in colonial administration.

Colonial service in the Danish West Indies (1822–1834) Following his father's death in 1827, Oxholm returned to Saint Croix to oversee the family estates, together with his elder brother Frederik Thomas (“Fritz”) Oxholm. Their combined holdings amounted to about 750 acres, and the brothers succeeded in restoring their profitability after years of financial strain. At that time, the Oxholm brothers owned the plantations ‘Mountain’, 'Mint' and ‘Envy’ in the Prince's Quarter. Both maintained a close working relationship with Governor-General Peter von Scholten, who became their father's successor and later patron. He embarked at Falmouth on the Danish brig St. Jan at the end of May 1827 and reached the islands on 8 July.

That same year, von Scholten appointed Waldemar Oxholm his adjutant, a position that made him one of the Governor-General's principal aides. Oxholm accompanied von Scholten on official voyages through the Caribbean and to North America. In the summer of 1830, Oxholm travelled with von Scholten to the United States, then continued independently to Canada, journeying across Lake Ontario and visiting Niagara Falls before rejoining von Scholten in New York City. During this period, reports reached them of the July Revolution in France, which provoked widespread excitement in the US and was soon commemorated with public celebrations in major American cities. Staying in the US, they travelled to Washington, D.C. in October 1830, where they conducted a diplomatic mission and met with President Andrew Jackson, discussing commercial relations and maritime issues.

His duties also included dispatches to Spanish territories (notably Puerto Rico) and to the Venezuelan littoral, and courier service among the Danish islands. Between 1830 and 1834 Oxholm travelled repeatedly between Europe and the West Indies, sometimes recalled for reasons of health but consistently reappointed to the Governor-General's staff. He was active in the negotiations over the legal status of the free people of colour ().

Returning to Europe with Governor-General Peter von Scholten in the spring of 1834, Oxholm arrived at Copenhagen in August and was tasked with assisting Scholten in the ongoing governmental consultations on the future of the colonial slave system in the Danish West Indies. The assignment was given in recognition of Oxholm's previously demonstrated interest in West Indian questions, and he remained engaged in the work until the consultations concluded in November that year. During this period he continued to travel between Europe and the Caribbean. On 21 October 1834 he was appointed a Knight of the Order of the Dannebrog, and was subsequently promoted to captain in the Life Guards. The following decade saw him drawn further into the royal household and diplomatic life. Also in 1834, he was appointed government councillor ().

Early court service

Tutor to Prince Christian of Glücksburg In 1834, Frederik VI appointed Oxholm tutor-governor () to the young Prince Christian of Glücksburg (the future King Christian IX) and to Prince Frederick of Hesse (nephew of Frederick VI), son of Landgrave Wilhelm of Hesse and Louise Charlotte of Denmark. The appointment commended Oxholm as “a prudent and intelligent man of pure conduct,” suited to guide the princes “in learning to know the world, in mastering the true economy, and in employing their time in a manner appropriate to their station". His task was both educational and moral. Oxholm was instructed to accompany the princes on their travels, first to Louisenlund Castle in Schleswig, then to Hanover to meet with King Ernest Augustus, and finally to Bonn, where they attended lectures at the University for roughly two years. The programme of instruction emphasised natural law, modern history, French, and English, alongside regular lectures and practical exercises in household economy and bookkeeping. He was to report weekly to the king, submit monthly accounts, and ensure that the princes maintained “right principles in religion,” regular study habits, and the manners expected of their rank.

During the princes’ residence abroad, a close, trusting and enduring friendship developed between Oxholm and Prince Christian. The sojourn is generally regarded as the beginning of the close and lasting relationship between Oxholm and the future King Christian IX, and would later prove of great significance to both men.

Service to the crown prince and central administration Upon the princes’ return, Oxholm entered service in the central administration. In 1841, he was appointed as commissioner in the General Customs Chamber () “with the West Indian cases to hand". Christian VIII wrote to von Scholten on this occasion: "With him, one can be sure of knowledge and integrity". He was given concurrent placement à la suite as major in recognition of his military seniority.

He helped organise Frederik's 1841 marriage to Duchess Caroline Mariane of Mecklenburg. From 1842 to 1847 he served as Lord Chamberlain of the Household () to the crown prince, Frederik (later Frederik VII), administering the prince's household, coordinating ceremonial and travel, and acting as a principal liaison between the heir apparent and the ministries. He held this position for five years, but resigned in 1847 in protest at the crown prince's liaison with Louise Rasmussen, later Countess Danner. The rupture, however, was not permanent, and following his accession in 1848, Frederik VII again turned to Oxholm for advice in forming his first constitutional government.

Ennoblement In 1839 von Scholten recommended to King Christian VIII that the Oxholm siblings be admitted to the Danish nobility. This occurred in 1840, when the family was ennobled, in recognition of the family's contribution to the recovery of the West Indian colonies and their own conduct in local administration. Von Scholten's petition described their father's “great service to the islands after the occupation” and attested “in the strongest terms to the brothers’ character and bearing”. The ennoblement occurred by resolution of 11 February 1840 and patent of 24 June of the same year. As newer members of the aristocracy, the Oxholm family formed part of the lesser nobility (gentry).

1848 revolution and legislative career (1848–1853)

March days and the formation of the March Ministry

In early 1848 Denmark stood at the intersection of European upheaval and a domestic constitutional crisis. The February Revolution in Paris and tumults in Vienna and Berlin emboldened Denmark's National Liberals, whose programme called for a responsible ministry, a free and democratic constitution, and an Eider policy integrating Schleswig with the kingdom. Simultaneously, a counter-movement in the duchies, centred in Kiel, pressed for Schleswig–Holstein’s alignment with the German Confederation, raising the spectre of civil war and foreign intervention. Following Christian VIII’s death (20 January 1848), the new king Frederik VII confronted mass petitions and demonstrations in Copenhagen demanding constitutional government.