Saint Kentigern was from Lothian (in Scotland), and may have been of royal blood. He left home at an early age and was brought up by a hermit named Servan (July 1) on the Firth of Forth. It was St Servan who gave him the name Mungo (or dear friend).
St Kentigern Mungo labored in Strathclyde, and founded a monastery where the city of Glasgow stands today. He was made a bishop, taking Glasgow for his See.
Driven from Scotland by the enmity of a local ruler, St Kentigern went to Wales and founded the monastery of St Asaph. Eventually, he returned to Scotland and resumed his missionary work, baptizing many people.
In 584 he met St Columba (June 9), and exchanged croziers with him. St Kentigern was a strict ascetic who traveled everywhere on foot. It is believed that he died in Glasgow around 612 at the age of eighty-five. A Gothic cathedral was built over his shrine in the thirteenth century. SOURCE: