The Diocese of Växjö () is one of the 13 dioceses or regional units of the Lutheran Church of Sweden. It was also a former Roman Catholic bishopric. Lutheran diocese Diocese of Växjö is situated in southern Sweden and includes most of the county of Jönköping at its north end, the southern and central parts of the county of Kalmar, the island of Öland in the east, the county of Kronoberg in the south, and a small part of the county of Halland in the west. The diocese consists of 249 parishes, and has the highest church attendance in Sweden. The city of Växjö is the site of the episcopal see of Diocese of Växjö. In the twelfth century, the construction of Växjö Cathedral was begun and hence Växjö grew to become an important religious centre in the Diocese of Växjö. Saint Sigfrid allegedly lived and died in Växjö, and was buried in the cathedral at his death. Former Catholic diocese The ancient episcopal see of Växjö comprised the regions Värend and Njudung in Småland. Its patron saint was Saint Sigfrid, who in 1158 was canonized by Adrian IV and his shrine was, until the Protestant Reformation, the glory of the Cathedral of St. John the Baptist and St. Sigfrid at Vexiö. He had no immediate successors and in 1126 King Sigurd Jorsalafarer of Norway led a crusade to Småland to Christianize its inhabitants. Little is known about the origin of the diocese. It may have been Danish, or it may have broken loose from the diocese of Linköping between 1164 and 1170. The second bishop was Stenar, who is mentioned in two letters dating from 1183. In 1191 he quarreled with the Bishop of Linköping concerning the frontiers of their respective dioceses. Stenar was succeeded in 1193 by John Ehrengisleson. In 1205 the biography of St. Sigfrid was written. Bishop Gregory (about 1241), or his successor, renewed the boundary dispute with the Bishop of Linköping, which was settled by the pope in 1248 or 1249. Bishop Bo (1287–91) appealed in a dispute to the Archbishop of Lund, which was regarded as an insult to the Archbishop of Upsala. Conflict was averted by Bo's death and a declaration of obedience to the Archbishop of Upsala, issued by the chapter of Vexiö. The most famous of the later bishops was Nicolaus Ragvaldi (1426–38), present at the Council of Basle, and in