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Tassilo III ( c. 741 – c. 796) was the duke of Bavaria from 748 to 788, the last of the house of the Agilolfings.

Tassilo III was the son of Odilo Duke of Bavaria and Hiltrud. Whilst still a child, began his rule as a Frankish ward under the tutelage of his uncle, the Carolingian Mayor of the Palace Pepin the Short (later king) after, Duke Odilo of Bavaria, had died in 748 and Pepin's half-brother Grifo had tried to seize the duchy for himself. Pepin removed Grifo and installed the young Tassilo as duke, but under Frankish overlordship in 749.

Following his installation by Pippin in 749, Tassilo being still a minor had his mother Hiltrud ruled in his stead until her death in 754 and then Pippin took this responsibility until Tassilo was old enough in 757 but as a Vassal to Pippin the Short.

Then, in 757, according to the Royal Frankish Annals, Tassilo became Pepin's vassal and the lord for his lands at an assembly held at Compiegne. There, he is reported to have sworn numerous oaths to Pepin and, according to reports that may have been written much later, promised fealty to him and his sons, Charles and Carloman. However, the highly legalistic account is quite out of character for the period. K. L. Roper Pearson has suggested that it probably represents a reworking of the original document by the annalist to emphasise Charlemagne's overlordship over Tassilo during the period of hostilities between the two rulers.

Around 760, Tassilo married Liutperga, daughter of the Lombard king, Desiderius, continuing a tradition of Lombardo-Bavarian connections. He made several journeys to Italy to visit his father in law and to establish political relations with the pope.

In 764 He brought the Relics of St. Valentine to Passau.

It is reported that Tassilo had gained such a reputation that he was regarded as a kingly ruler when his cousins Charles and Carloman assumed power in the Frankish realm in 768. That year, he founded Gars Abbey on the Inn River, in southern Bavaria. In the following year, 769, Tassilo issued in Bolzano the foundation charter of the Innichen Abbey. He was, however, not able to protect the pope against Lombard expansions, which has been seen as a reason for Rome's lack of support for him during his later conflict with Charlemagne. Still, there is a consensus among historians that Tassilo, despite acting as a kingly sovereign, did not intend to become king himself.

Tassilo nevertheless undertook such kingly duties as founding Kremsmünster Abbey. In 772, Tassilo sent his son Theodo to Italy to visit the court of his grandfather, Desiderius, and to be baptised by Pope Adrian I in Rome on May 19. In 773, Tassilo sent an embassy to the pope, but it was blocked by Charles, who was suspicious of the duke's alliances with Saxons, Wends and Avars. Tassilo also exercised power as he ruled over local a local Bavarian council that the Bavarian dukes of the Agilolflings historically had presided over and were replaced by the bishops of Salzburg would take this responsibility after Charlemagne removed Tassilo.

In 788 Tassilo was accused by the Franks of defaulting on his military obligations to Pepin, leaving the Frankish campaign in Aquitaine on grounds of ill health way back in 763. Roper Pearson suggests that he left because he felt an obligation to the Aquitanians in light of an earlier alliance, made between Tassilo's father and the Aquitanian duke Hunoald I during his conflict with Pepin in 743. Whatever the motivations behind Tassilo's abandonment of the campaign, the Royal Frankish Annals for that year are particularly scathing of him, saying that he "brushed aside his oaths and all his promises and sneaked away on a wicked pretext". Working on the premise that the annals may have been revised to emphasise Tassilo as a vassal, Roper Pearson suggests that to be the beginning of a campaign to depict Tassilo as an oath-breaker and someone unprepared to carry out the main function of his office, to fight, which would make him unfit for rule. In Einhard's Life of Charlemagne, the justification for the removal of Tassilo from power was that he had conspired to avenge the deposed Lombard King Desiderius and been in communication with the Huns. Stuart Airlie has argued that potentially the removal of Tassilo could have been the result of his greater local power thus making him a threat to Carolingian rule as he was acting with greater indipendence.

The incident was the linchpin in Charlemagne and Pope Adrian's argument that Tassilo was not an independent prince but a rebellious vassal, deserving punishment. The punishment was carried out, after much political maneuvering, during a diet in the Imperial Palace Ingelheim in 788, when Tassilo was finally deposed and then entered a monastery. In 794, Tassilo was again compelled, at the Synod of Frankfurt, to renounce his and his family's claims to Bavaria. He formally handed over to the king all of the rights that he had held.

A lost chronicle of Tassilo's reign was kept by his chancellor, Creontius. It was partially preserved in the 16th-century when Johannes Aventinus incorporated some of its material into his Bavarian history.

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 * 1) Notari, Tamas (2009). Personal Status and Social Structure in Early Medieval Bavaria. Acta Juridica Hungarica.
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 * 4) ^ Kathy Lynne Roper Pearson, Conflicting Loyalties in Early Medieval Bavaria: a View of Socio-Political Interaction, 680–900. (Aldershot: Ashgate), 1999.
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 * 7) ^ According to legend, Tassilo discovered the body of his son, Gunther, who had been attacked by a wild boar during a hunt. In grief, he founded the monastery on the site in 777.
 * 8) ^  p. 188
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