context: Firstly in about 1446, at the age of only thirteen,[1] he married Anne de Ferrers (d.9 January 1469), the daughter and heiress of William de Ferrers, 6th Baron Ferrers of Chartley,[2][3] and thereby became jure uxoris Baron Ferrers of Chartley (in right of his wife) on 26 July 1461.[4] His wife Anne inherited great wealth upon the death of her father. Through the marriage, the Devereux family gained Chartley Castle as well as its barony.[5] By his wife, who predeceased him by seventeen years, he had at least six children including:
  Sir Robert Devereux of Ferrers (c1455 to ?),[6] who was appointed a Justice of the Peace for Shropshire on 24 February 1473, and again on 8 Nov 1473.
  John Devereux, 8th Baron Ferrers of Chartley (1463 - 3 May 1501)[4][2]
  Elizabeth Devereux, who married firstly to Sir Richard Corbet of Morton Corbet, and secondly to Sir Thomas Leighton of Wattlesborough.[4][2]
  Anne Devereux, who married, as his first wife, Sir Thomas Tyrrell (c.1453–1510?), son of Sir William Tyrrell (slain at the Battle of Barnet in 1471) by his wife, Eleanor Darcy.[7][2][8]
  Isabel ("Sybil") Devereux, who married Sir James Baskerville.[4]
  Sir Richard Devereux[4][2]
  Sir Thomas Devereux[4][2]
  Secondly, he married a certain lady named Jane (fl.1522),[9] by whom he had no further children. She survived him and remarried thrice: firstly to Thomas Vaughan, secondly to Sir Edward Blount of Sodington, and thirdly to Thomas Poyntz (d.1501) of Alderley, Gloucestershire,[4] an Esquire of the Body of King Henry VII at the baptism of his first-born son, Prince Arthur. He was the second son of Sir Robert Poyntz (died 1520), Lord of the manor of Iron Acton in Gloucestershire, a supporter of King Henry VII at the Battle of Bosworth in 1485.[10]
question: When did Walter Devereux become the 7th Baron Ferrers of Chartley?
answers.text: 1446 26 July 1461