He was born in Ladenburg a/d Neckar as the son of Johannes Dammius who moved to Haarlem before 1578 where he gave the first Protestant sermon in the Grote Kerk, Haarlem after Haarlem was freed from Spanish (Catholic) occupation. The young Damius was educated along with his brother Mathias to become a doctor, but both brothers later became political rebels after their father died in 1612, acting against the remonstrant council of Haarlem in 1618. Mathias was banned from the city for supporting Adriaen Jacobsz Tetrode and Daniel de Souter when he published 3 contra-remonstrant pamphlets in 1617 starting with Requeste der dolerende Kercke te Haerlem.[1] He and his brother were reinstated after the political changeover in 1618. Johan became a judge and later mayor.
He also became captain of the St Adrian militia in 1619-1621 and 1624-1625, becoming fiscaal/provost in 1625-1627. He was married twice; to Catharina van Deutekom on 6 February 1596 and to Anna van Offenberg 29 October 1620.[2]
Johan Damius De Haarlemse Schuttersstukken, by Jhr. Mr. C.C. van Valkenburg, pp. 60, Haerlem : jaarboek 1961, ISSN 0927-0728, on the website of the North Holland Archives
