There were dynastic troubles for both Burgundy and Vienay in the early 14th century, but there was one important difference: Lucally there was no rule of priestly celibate in the western churches. Rather the rule was like in the OTL Orthodox churches: if a priest wanted to marry he had to do so before he got ordained. In the Gaulish churches even bishops could be married, and although bishoprics formally could not be inherited — bishops were elected by a college of presbyters and metropolites and patriarchs were elected by a college of bishops — in practice bishoprics were often conferred on a son or nephew of the previous bishop, especially if the bishop was also the secular ruler of his diocese. The most notable such prince-bishopric was Proence.
Thus Herrig Dieophí, bishop of Meç (OTL Henri Dauphin, bishop of Metz) was married to Mary, daughter of Duke Robert II of Burgundy. Just as OTL Guighe de Vienay died young and childless and was succeded by his brother Hombert II of Vienay. Hombert was incompetent and uninterested in government and left it to his uncle, bishop Herrig, and when Herrig died in 1349 the likewise childless Hombert abdicated in favor of Herrig’s (unordained) second son, also named Guighe (1320-1386), and when Philip I of Burgundy died of the plague in 1361 Guighe IX of Vienay also became Guighe I of Burgundy. Guighe realized that the war over the succession to the throne of France, raging between the houses of Burgundy, Normandy and Valois could not be won as long as it was an all on all war with three parties.