Baptised at Winchester by his father's first cousin, St. Timothy, according to legend. Lucius the Great founded the first church at Llandaff and established Christianity in place of Druidism. He is reputed to be the first Christian king in Britain.

Lleuver Mawr (Lucius the Great) , the Second Blessed Sovereign
(Cadwalader was the Third Blessed Sovereign), was baptized by his
father's first cousin, St. Timothy, who suffered martyrdom at age 90 on
August 22, 139. When in 170 A.D. Lucius succeeded to the throne of
Britain he became the first Christian king of the world. He married
Gladys, daughter of Eurgen, granddaughter of Marius and his wife, the
daughter of Boadicea (Victoria). Lucius founded the first church at
Llandaff and changed the established religion of Britain from Druidism
to Christianity. He died in 181, leaving an only one recorded child, a
daughter, Gladys.
