Sir Henry Grey, Kt., of Keteringham

Inscription identifying Henry Gray as son of Joan (Mowbray) Gray's son:

"Here lyeth Syr Henry Grey, the sonne of Syre Thomas Grey, and Jone, hys wyf, that was systere to the Duke of Norfolk, that dyed at Venis."

[Reference: Scott, Memorials of the Family of Scott (1876), p. 126 footnote p].

The Duke of Norfolk who died in Venice (above mentioned in inscription) was Thomas Mowbray, Duke of Norfolk, who died there of pestilence in 1399. He was the son of John de Mowbray, 4th Lord Mowbray, and his wife, Elizabeth de Segrave.

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Also:
http://www.tudorplace.com.ar/GREY4.htm