St Richard of Chichester . . . probably

No, I don't mean probably a saint.  Bishop Richard de Wyche is a saint all right. He was canonized by Urban IV on January 12, 1262.  And today is his feast day.

Probably.

Well, the good old Catholic Encyclopædia says it is.  But there's been a whole lot of liturgical tinkering since the early part of the 20th century when the original Catholic Encyclopædia was printed.  And the old Roman Martyrology says so, too.  (But see above re: tinkering.)  Wikipedia says today sometimes is but that some folks keep it in June, Lent being well and truly over by then and a better time for keeping a feast day.  And then it says the Catholic Church still keeps it on 3 April and gives the text of St Richard's collect from the Ordinariate Missal, to wit:

MOST merciful Redeemer,
who gavest to thy Bishop Richard a love of learning,
a zeal for souls, and a devotion to the poor:
grant that, encouraged by his example,
and aided by his prayers,
we may know thee more clearly,
love thee more dearly,
and follow thee more nearly,
day by day;
who livest and reignest with the Father
in the unity of the Holy Spirit, ever one God,
world without end. Amen.

Except the Ordinariate calendar keeps his day on 16 June.

So take your pick.  Either day is a good day to honour a sturdy English bishop who didn't take any guff from kings or libidinous clergymen.

The good old Catholic Encyclopædia gives his life here.

Wikipedia's text is here.

This site gives a few additional facts and seems pretty certain he was a Dominican, wearing their habit.  (Perhaps 3d Order?)