List of 27 ancestors found in 40 iterations (25 distinct persons and 27 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 - 2 person(s) on 4 (2 distinct persons)
Generation 3 - 4 person(s) on 8 (4 distinct persons)
8Jean d'Arras (1040-1109)
9Thamar d'Arras (~1044-)
10Robert Ier de Boisleux (1064-)
11Havoise de Fremicourt (1070-~1124)
Generation 4 - 4 person(s) on 16 (4 distinct persons)
Generation 5 - 8 person(s) on 32 (8 distinct persons)
Generation 6 - 6 person(s) on 64 (6 distinct persons)