[3] Within the Roman Catholic bishopric, the ancient episcopal see of Växjö comprised the regions Värend and Njudung in Småland.

In 1126, King Sigurd Magnusson of Norway is known to have led a crusade to Småland to Christianize its inhabitants.

Saint Sigfrid allegedly lived and died in Växjö, and was buried in the cathedral at his death.

Conflict was averted by Bo's death and a declaration of obedience to the Archbishop of Upsala, issued by the chapter of Vexiö.

The last Roman Catholic bishop was Ingemar Petri (consecrated 1495), who, by judicious concessions, remained at Vexiö until his death in 1530.

He took no part in episcopal consecrations during Gustav I Vasa's reign, when the Catholic hierarchy was replaced by the Lutheran state religion.