While Charles was engaged in his Saracen war, the puppet-king Theuderich IV., in whose name he had been ruling for the last seventeen years, chanced to die. [Sidenote: Four kingless years, 737-42.] So little had the royal name come to mean, that the great mayor did not seek out the next heir of the childless king and crown him, but ruled for the last four years of his life without any suzerain. He did not himself, however, take the kingly title, but continued to be styled mayor, prince, or duke of the Franks; he cared not for name or style so long as the real power was in his hands. The reconquest of Provence and northern Septimania was the last of the great mayor’s triumphs. But the four years which he had yet to live were not without their importance. In 738 he compelled the Westphalian Saxons on the Lippe and Ems to do him homage and pay tribute. In 739 the organisation of the south German church was completed by the erection of four bishoprics in Bavaria, which looked to Boniface, now archbishop of all Transrhenane Germany, as their Metropolitan. Thus Bavaria became ecclesiastically an integral part of the Frankish Church, even as politically it had already become an integral part of the Frankish empire. [Sidenote: The Pope asks aid from Charles, 739.] But though Charles was a firm supporter of the Church in his own dominions, he would not interfere in ecclesiastical disputes beyond his frontier. Pope Gregory III. had plunged into a struggle with the Lombard king Liutprand, and invited the pious ruler of the Franks to march against the enemy of the Church. But Charles refused; Liutprand had given him some aid against the Saracens, and he was not minded to attack an old ally merely because the Lombard had fallen out with the Pope concerning the duchy of Spoleto.