She controlled after his death the Baltic principality of her husband. On the death of Peter II in 1730, the leading Russian bureaucrats sought a weak ruler whom they could control, and they invited (elected) Anna to become empress under agreements that limited her authority. She and her advisor Ernst Johann Biron (1690-1772), accepted the agreements and then overthrew the limitations. Anna's reign is considered one of strong German influences, as Baltic nobles took positions in the Russian government, and of growing aristocratic control over the peasantry. In her reign also, Russia extended its influence in Poland and against Turkey (1736-39). Her death in 1740 precipitated a series of crises from which her cousin Elizabeth emerged as empress in 1741.