Nyland and Tavastehus County, or Uusimaa and Häme Province, was a county of the Swedish Empire from 1634 to 1809, and a county of Grand Duchy of Finland from 1809 to 1831.
In 1775 whole northern part of the county (later Central Finland region) was transferred to the new Vasa County. Also a part of historical Satakunta was added to the Nyland and Tavastehus County from the Åbo and Björneborg County, while Upper Hollola was transferred to the new Kymmenegård County.
By the Treaty of Fredrikshamn in 1809 Sweden ceded all its territories in Finland, east of the Torne River, to Russia. The county still continued to exist as a province of the new autonomous Grand Duchy of Finland until 1831, when it was split to Tavastehus County (Häme Province) and Nyland County (Uusimaa Province).
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Governors Arvid Göransson Horn af Kanckas 1634–1640 Arvid Göransson Horn af Kanckas 1640–1648 (Tavastehus County) Reinhold Mettstake 1640–1642 (Nyland County) Jacob Uggla 1642–1648 (Nyland County) Erik Andersson Oxe 1648–1652 Ernst Johan Greutz 1652–1666 Udde Knutsson Ödell 1666–1668 Axel Eriksson Stålarm 1668–1678 Axel Rosenhane 1678–1685 Jonas Klingstedt 1685–1687 Karl Bonde 1687–1695 Mårten Lindhielm 1695–1696 Abraham Cronhjort 1696–1703 Johan Creutz 1703–1719 Per Stierncrantz 1719–1737 Axel Erik Gyllenstierna af Lundholm 1737–1746 Gustaf Samuel Gylleborg 1746–1756 Anders Johan Nordenskjöld 1756–1761 Hans Erik Boije af Gennäs 1761–1772 Carl Ribbing af Koberg 1773 Anders Henrik Ramsay 1774–1776 Anders de Bruce 1777–1786 Carl Gustaf Armfelt 1787–1788 Johan Henrik Munck 1790–1809 Gustaf Fredrik Stiernwall 1810–1815 Gustaf Hjärne 1816–1828 Carl Klick 1828–1831
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