King Edwin of Northumbria is converted to Christianity by Paulinus, Bishop of York.

Edwin, also known as Eadwine or Æduinus, was the King of Deira and Bernicia – which later became known as Northumbria – from around 616 until his death. He was the second monarch to rule both of these northern English kingdoms and the first to convert to Christianity. After he died in battle, he was venerated as a saint.

Paulinus was a Roman missionary and the first Bishop of York. A member of the Gregorian mission sent in 601 by Pope Gregory I to Christianize the Anglo-Saxons from their native Anglo-Saxon paganism, Paulinus arrived in England by 604 with the second missionary group. Little is known of Paulinus's activities in the following two decades.

York is a cathedral city in North Yorkshire, England, with Roman origins, sited at the confluence of the rivers Ouse and Foss. It has many historic buildings and other structures, such as a minster, castle and city walls, all of which are Grade I listed. It is the largest settlement and the administrative centre of the wider City of York district. It is located 27 miles (43 km) north-east of Leeds, 90 miles (140 km) south of Newcastle upon Tyne and 207 miles (333 km) north of London. York's built-up area had a recorded population of 141,685 at the 2021 census.

April 12 is the 102nd day of the year in the Gregorian calendar; 263 days remain until the end of the year.