 When Sigebert I of Austrasia died in 575, Chilperic sent Desiderius to invade his kingdom, but Guntram of Burgundy sent the patrician Mummolus against him and Desiderius was defeated and forced to retreat, leaving Austrasia to Sigebert's son Childebert II.The following year, with the armies of Bladast and Berulf, surrounded the territory of Bourges.They subsequently devastated the Touraine, as recorded by the then bishop of Tours, Gregory, the historian.