Family tree Helmantel » Sources » Spinnen in het web van H. Feenstra; http://www.vanbritsom.com/library/italiaanse%20%20friese%20studenten/Tervoort%20%282%29.pdf; Het geheime dagboek van de Groninger stadssecretaris Johan Julsing 1589-1594 van Johan Julsing; Mededelingen van het Nederlands Historisch Instituut te Rome 1921-2002
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