John DE LACY , 2nd Earl of Lincoln

  General Notes:

https://en.wikipedia.org/wiki/John_de_Lacy,_2nd_Earl_of_Lincoln
He was the eldest son and heir of Roger de Lacy and his wife, Maud or Matilda de Clere (not of the de Clare family).

John married Margaret DE QUINCY , 2nd Countess of Lincoln, daughter of Robert DE QUINCY and Hawise OF CHESTER , 1st Countess of Lincoln, before 21 Jun 1221. (Margaret DE QUINCY , 2nd Countess of Lincoln was born about 1206 in England and died in Mar 1266 in Hampstead, Middlesex, England.)