Sir John de Lacy 2nd Earl of Lincoln, 7th Baron of Halton, Magna Carta Surety 1
- Born: Abt 1192, Lincoln, Lincolnshire, England
- Marriage (1): Margaret de Quincy 2nd Countess of Lincoln suo jure
- Died: 22 Jul 1240, Stanlaw, Chester, Cheshire, England about age 48
John married Margaret de Quincy 2nd Countess of Lincoln suo jure, daughter of Sir Robert "the Elder" de Quincy 2nd Earl of Winchester and Hawise de Meschines Countess of Lincoln. (Margaret de Quincy 2nd Countess of Lincoln suo jure was born about 1208 in Lincoln, Lincolnshire, England and died on 30 Mar 1266 in London, England.)
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