Spellingvariant: Jacques van Reiningen, Jacob Keest, Jacob (van) Reinegom (Reninge, of Reyninghen).
Jacques Outerman born ca. 1547, probably in Flanders, Belgium, died at an advanced age before 1639 at Haarlem, Holland. As an elder he played an important role among the Mennonites of the Netherlands. He was also called Jacob Keest, Jacob (van) Reinegom (also Reninge, or Reyninghen). In 1586—he was then a deacon at Franeker in Friesland—he opposed Thomas Bijntgens (Bintgens), the elder of the Flemish congregation in Franeker. The consequence was a division of the congregation into two factions known as the Thomas Bijntgensvolk or Huiskoopers (Housebuyers) and the Jacob Keestvolk or Contra-Huiskoopers. This schism was not induced solely by the purchase of a house, but had its roots in the practice of the ban, the Huiskoopers being the stricter, the Jacob Keestvolk the more lenient group. The division was not confined to the Franeker congregation. Soon there were found everywhere Old Flemish (followers of Bijntgens) and Young (or Gentle) Flemish, usually called simply Flemish, the party of Outerman being the more numerous.
Later Outerman was elder of the large Haarlem Flemish congregation "in den Block." About 1616 he was deposed and banned by Jan Luies, the elder of strict Groningen Mennonites; however his congregation remained loyal to him.
Oesewolt (Hindericks) stelde zich op als tegenstander van de invloedrijke Jacques Outerman (1547-na 1634), de oudste van de Vlaamse gemeente 'De Blok' te Haarlem. Oesewolt verzette zich namelijk tegen diens toenadering tot de Friese richting (binnen de doopsgezinden).
Il est marié avec Susanna Crommelin.
Ils se sont mariés à l'église le 13 mars 1635 à Haarlem, il avait 88 ans.Source 4