 Setting aside the Portuguese claims, the Houtman Abrolhos first appear on a published map in 1622, on a little-known portolan by Hessel Gerritsz.They are unlabelled, however, being marked merely as a group of small circles.They are first named in print in Gerritsz' 1627 map "Caert van't Landt van d'Eendracht", where they bear the label "Fr.