who in 359 made treaties with Julian the Apostate. Macrian was deposed in an expedition ordered by Valentinian I in 370. Macrian appears to have been involved in building a large alliance of Alemannic tribes against Rome, which earned him the title of turbarum rex artifex ("king and crafter of unrest"). The Romans installed Fraomar as a successor of Marcian, but the Bucinobantes would not accept him and he was expelled and Macrian restored and Valentinian made the Bucinobantes his foederati in the war against the Franks. Macrian was killed on campaign against the Franks, in an ambush laid by the Frankish king Mallobaudes. Gibuld (fl. 470) is the last known king of the Alemanni. His raid on Passau is mentioned in the vita of Saint Lupus. The name of Gibuld's successor who was defeated at Tolbiac is not known. Merovingian duchy After their defeat in 496, the Alemanni bucked the Frankish yoke and put themselves under the protection of Theodoric the Great of the Ostrogoths but after his death they were again subjugated by the Franks under Theudebert I in 536. Thereafter, Alamannia was a nominal dukedom within Francia. Though ruled by their own dukes, it is not likely that they were very often united under one duke in the 6th and 7th centuries. The Alemanni most frequently appear as auxiliaries in expeditions to Italy. The Duchy of Alsace was Alemannic, but it was ruled by a line of Frankish dukes and the region around the upper Danube and Neckar rivers was ruled by the Ahalolfing family and not by the ducal house which ruled central Alamannia around Lake Constance. Rhaetia too, though Alamannic, was ruled by the Victorids coterminously with the Diocese of Chur. Alamannia was Christianised during the 7th century, although not as thoroughly as either Francia to its west or Bavaria to its east. The first Alamannic law code, Pactus Alamannorum, dates to this period. The Roman dioceses of Strasbourg and Basel covered Alsace and that of Chur, as mentioned, Rhaetia. Alamannia itself had a diocese only in the east, at Augsburg (early 7th century). There were two Roman bishoprics, Windisch and Octodurum, which were moved early to other sites (Avenches and Sitten respectively). Western Alamannia did eventually (7th century) receive a diocese (Constance) through the cooperation of the bishops of Chur and the Merovingian monarchs. The foundation of Constance is obscure, though it was the