According to his Vita, Sulpicius was born at Vatan (Diocese of Bourges), of noble parents, before the end of the sixth century.

From his youth he devoted himself to good works and to the study of Scripture, and donated his large patrimony to the Church and the poor.

[3] Austregisilus, Bishop of Bourges, ordained him cleric of his church, then deacon, and finally made him director of his episcopal school.

Clotaire II (King of the Franks from 613 to 629), who had heard of his merits, summoned him and made him almoner and chaplain of his armies.

The Vita tells that Dagobert I sent his representative the merciless general Lollo (Lollonius) to reside at Bourges and to bring the city more closely under the king's command.