Thomas Cranmer, Archbishop of Canterbury, and the First Book of Common Prayer

Almighty and everliving God, whose servant Thomas Cranmer, with others did restore the language of the people in the prayers of thy Church: Make us always thankful for this heritage; and help us so to pray in the Spirit and with the understanding, that we may worthily magnify thy holy Name; through Jesus Christ our Lord, who liveth and reigneth with thee and the Holy Spirit, one God, for ever and ever. Amen.

The first Book of Common Prayer was introduced on Whitsunday, June 9, 1549. This event is commemorated on a weekday following Whitsunday. Lesser Feasts and Fasts fixes the commemoration on June 10. Archbishop Cranmer himself is sometimes included in the commemoration.