Trasimund 1 was dux of Spoletium; during the papacy of Gregory III (Gregorios 7) (731-741) Trasimund 1 attacked the fort of Gallense, which was in dispute between the ducatus of Rome and the ducatus of Spoletium ("Gallensium castrum, pro quo cotidie expugnabatur ducatus Romanus a ducato Spolitino"); he abandoned his claim after receiving a large sum of money from Gregory (the pope ended the dispute, "dans pecunias non parvas Trasimundo duci eorum"): Lib. Pont. 92. 15. Later Trasimundus, "dux Spolitinus" (or similar), was attacked by the Lombard king Liutprand 1 and took refuge in Rome (in 739); when the Romans, under pope Gregory III and the dux Stephanos 77, refused to give him up, Liutprand 1 laid siege to Rome and captured four cities which belonged to the ducatus of Rome, before withdrawing in August 739 (indiction seven); Trasimundus jointly with a Roman army invaded the ducatus of Spoletium (in 740; see Duchesne, Lib. Pont., n. 7 on p. 436) and received the submission of the Marsi, Furcona, Valva and Pinna and also of Reate in Sabinum and then entered Spoletium in December: Lib. Pont. 93. 2-3. He subsequently failed to carry out the promises which he had made in return for Roman help, which included the restoration of the four lost cities, and at this point, while Liutprand 1 also was preparing for war against Rome, pope Gregory died (November 28, 741): Lib. Pont. 93. 4. An embassy from Pope Zacharias 16 to Liutprand 1 made peace and Liutprand and a Roman army jointly advanced against Trasimund 1 in Spoletium; Trasimund then emerged from Spoletium and surrendered to Liutprand: Lib. Pont. 93. 5. Soon afterwards the four cities seized by Liutprand during the siege of Rome on account of Trasimund ("pro praedicto Trasimundo duce Spolitino") were restored under Zacharias 16: Lib. Pont. 93. 8.

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