Thomas Grey (1384-1415)
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Sir Thomas Grey of Heaton (Alnwick Castle, November 30, 1384– August 5, 1415, Southampton), was the son of Sir Thomas Grey of Heaton and Joan Mowbray. Born at Alnwick Castle, seat of the Percy Earls of Northumberland, he came from an old military family of the North Country.
What part, if any, he played in the Percy revolt of 1405 is not clear. However, he became a ringleader of the Southampton Plot in 1415, which aimed to murder King Henry V in Southampton before he sailed to France, and replace him with Edmund Mortimer, 5th Earl of March. However, Mortimer revealed the plot to the King, and the conspirators were promptly arrested and executed.
He married Alice Neville, daughter of Ralph Neville, 1st Earl of Westmoreland, by whom he had eight children:
- Elizabeth Grey (c. 1402–1454), married Sir Roger Widdrington
- Sir Thomas Grey (c. 1405–1443), without issue
- Sir Ralph Grey (1406–1443), married Elizabeth Fitzhugh and left issue
- Joan Grey (c. 1408–1488), married Sir John Salvine
- a daughter (b. c. 1410), married an Arundell
- William Grey
- Margaret Grey (b. c. 1414), married Gerard Widdrington
- John Grey
