Stamboom van Hagenbeek

Vader: Olivier Roo
Moeder: Mayken de Boosere

• Geboren: in 1559 te Doornik (Tournai)
• Overleden: op 20 mei 1652 (ongeveer 93 jaar oud) te Oldersom

1596 tot 1652.
Maeyken Boosers, who was a wealthy woman and only 24 years old when she was executed wrote in a graceful style. On one of the visits of her children to her cell she gave her son a pear. The boy did not eat the pear, but saved it; it is now in Amsterdam. This son Hans (Jan) (b. 1559) escaped to Emden and attended the disputation with the Reformed in 1578. He lived at the "Groote Veen" near Oldersum, East Friesland, where he died on 20 May 1652. This is known through the van Geuns family, which is descended from the de Boosers.

Hij woonde buiten Emden op het Groote Veen.

Het peertje (dat Mayken de Boosere aan haar zoon gaf) wordt bewaard in Universiteitsbibliotheek Amsterdam, Bibliotheca Mennonitica. Blijkens een notitie van de hand van de stad-Groninger zilversmid Jan de Booser (1634-1714) had hij het peertje van zijn grootvader J(oh)an(nes), ook wel Hans, de Booser gekregen.