Blood Royal:  Issue of the Kings and Queens of Medieval England 1066-1399:  The Normans and Plantagenets @ p. 42, footnote 8

The cited information was published by Heritage Books, 1996 (Ref: p. 42, footnote 8) The author/originator was T. Anna Leese.

• References (5)
  • Parent Source: Blood Royal:  Issue of the Kings and Queens of Medieval England 1066-1399:  The Normans and Plantagenets
  • Family: Heinrich Burwin I of Mecklenburg & Mathilde of Saxony
  • Individual: Heinrich Burwin I of Mecklenburg
  • Individual: Mathilde of Saxony
  • Marriage / Union: Heinrich Burwin I of Mecklenburg & Mathilde of Saxony