Dictionary of National Biography, George Smith, Oxford Press, Vols 1-21 (Orignially published 1885-90),Ed by Sir Leslie S @ IV:915, states John Comyn (d 1274) had four daughters all married into noble houses
The cited information was held in
{R500329294} (Ref: IV:915, states John Comyn (d 1274) had four daughters all married into noble houses)