It runs from about mid April to about the end of June and is named after Trinity Sunday, which falls eight weeks after Easter, in May or June.
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In the Church of Sweden and the Church of Finland, however, the Feast is celebrated on the seventh Sunday after Trinity, the eighth Sunday after Pentecost.
In this story, Arthur is king of England (also referred to as Bretayn) and holds court in Carlisle and Glastonbury, particularly during such summer feasts as Pentecost, Trinity Sunday, and St. John's Day.