List of 13 ancestors found in 30 iterations (13 distinct persons and 13 positions into tree)

Generation 0 - 1 person(s) on 1 (1 distinct persons)
Generation 1 - 2 person(s) on 2 (2 distinct persons)
Generation 2 - 4 person(s) on 4 (4 distinct persons)
Generation 3 - 2 person(s) on 8 (2 distinct persons)
12Hugues de Lannoy (~1140-)
13Richilde de Sainghin (~1150-)
Generation 4 - 2 person(s) on 16 (2 distinct persons)
Generation 5 - 2 person(s) on 32 (2 distinct persons)