sentences:  In his father's memory, and perhaps as an intended site of dynastic memorial, his son and successor Otto II with his consort Theophanu founded about 979 a Benedictine monastery near his "Kaiserpfalz", which within a short time had become one of the richest and most influential of the Imperial abbeys.Otto II endowed Memleben with large estates and privileges in present-day Thuringia, Saxony-Anhalt and Hesse, several of them formerly held by Hersfeld Abbey, and also tithe privileges in the Friesenfeld and Hassegau counties.The abbey also received Hevelli lands in the Northern March (present-day Brandenburg), which however were lost in the Great Slav Rising of 983, and further territories in the Saxon Eastern March.