Grandson of famous Rodrigo Manrique, (1406 – Ocaña, 1476), first count of Paredes de Nava, one of the pretenders to be recognized as "Maestre" of the military Order of Santiago, a nephew – grandson also of Bishop and Archbishop Iñigo Manrique de Lara (deceased 1585).
It is known however that Flemish – German born Johannes Bartholomeus Avontroot (born 1556), resident in the Spanish Canary Islands was some sort of administrator of a sugar manufacturer in Tazacorte and Argual also Flemish, Paulus Vandale.
One of Paulus daughters, María Vandale, had been married to a Melchor de Monteverde.
She married Avontroot as a widower from Don Melchor but the step children of Avontroot declared to the local inquisitors their new step father ate meat on certain days fast on meat dishes was compulsory for Catholics and suggested laziness about the step father attending Sunday masses.
Just before 1595 the Canary Islands Inquisition had already, apparently, a thick dossier on neglectful Avontroot.