sentences:  One of his most famous students was Hermann of Reichenau, who transmitted Arabic mathematics and astronomy to central Europe.Politically the abbot cleaved to his patrons Henry and to Henry III, duke of Bavaria and eventually Emperor, and wrote many letters and missives to the Hungarian kings Saint Stephen I of Hungary and Peter Orseolo of Hungary, containing various historical information about the Hungarian kingdom of that time useful for the historian.His activity in regard to Hungary was specially important during the reign of Stephen, as his wife was Gisela, the emperor Henry II's sister.