It is known that Roman the Great was killed at the Battle of Zawichost in 1205, possibly rushing to help Philip of Swabia, who was married to Anna's sister Irene Angelina. The existence of relations between Philip and Roman could be traced with the fact that Roman was recorded to be among the founders of the 12th century Peterskirche of Benedictine monastery in Erfurt when he gave as a charity 20 grzywna of silver.