Sir Guillaume I de Coucy[a] (died 1335), Lord of Coucy, Oisy, La Fère, Marle and Montmirail.

Guillaume was the son of Enguerrand V de Coucy and Christine de Lindsay.

[1] Guillaume married secondly Isabelle, daughter of Guy IV de Chatillon and Marie de Bretagne, they are known to have had the following known issue.

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