In 1799, Maria Naryshkina, born Princess Maria Czetwertyńska-Światopełk (who was a Polish noble and was for 13 years the mistress of Tsar Alexander I) purchased the palace. Her husband, Dmitri Lvovich Naryshkin, filled it with spectacular art and marble sculptures, as well as antiquities including gems, coins, and weapons. The palace became the center of the Saint Petersburg society, and its grand ballroom — also known as the Alexandrovsky or White Column Hall — played host to society balls of up to 1,000 people. The most famous ball was held on to celebrate the 16th birthday of the tsarevich Alexander Nikolaevich, the future Emperor Alexander II.