Mariensee () is a village in Lower Saxony, Germany, and a borough (, ) of Neustadt am Rübenberge. Its population was 1195 in April 2021.
Originally called , it became Mariensee () when, according to legend, a statue of the Virgin Mary washing up during a flood of the Leine was considered a divine sign. The first known written record of the new name dates to 1207, albeit in, as was customary at the time, Latin as (). Mariensee convent founded around 1213–14 still dominates Mariensee architecturally.
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