Abbot Uros
Abbot Uros's and the Hungarian abbots' letter to the Pope in which they ask for help (1242)
Mons Sacer 996-1996. Pannonhalma ezer éve. Szerk.: Takács Imre. Pannonhalma, 1996, volume I. p 502, section IV.4.
Archivio di Stato di Siena