St David, or Dewi, of WalesThe collect for today, the Feast Day of Saint David (c. 520-589), Bishop of Menevia, Patron of Wales (source):

Almighty God,
who called your servant David
to be a faithful and wise steward of your mysteries
for the people of Wales:
in your mercy, grant that,
following his purity of life and zeal for the gospel of Christ,
we may with him receive the crown of everlasting life;
through Jesus Christ your Son our Lord,
who is alive and reigns with you,
in the unity of the Holy Spirit,
one God, now and for ever.

The Gospel: St Mark 4:26-29
The Epistle: 1 Thessalonians 2:2b-12