An ice palace or ice castle is a castle-like structure made of blocks of ice. These blocks are usually harvested from nearby rivers or lakes when they become frozen in winter. The first known ice palace appeared in St. Petersburg, Russia, when Anna Ivanovna, Empress of Russia, commissioned an ice palace in St. Petersburg, Russia, during the winter of 1739–40. Architect Piotr Eropkin and scientist Georg Wolfgang Krafft used huge ice blocks measuring 16 m (52 ft) long by 5 m (16 ft) wide, joined together with frozen water, to build the palace. The city recreates the ice palace every winter.

Anna Ioannovna, also russified as Anna Ivanovna and sometimes anglicized as Anne, served as regent of the duchy of Courland from 1711 until 1730 and then ruled as Empress of Russia from 1730 to 1740. Much of her administration was defined or heavily influenced by actions set in motion by her uncle, Peter the Great, such as the lavish building projects in St. Petersburg, funding the Russian Academy of Science, and measures which generally favored the nobility, such as the repeal of a primogeniture law in 1730. In the West, Anna's reign was traditionally viewed as a continuation of the transition from the old Muscovy ways to the European court envisioned by Peter the Great. Within Russia, Anna's reign is often referred to as a "dark era".