Career
Lenaert Jansz de was married to Griet Jansdr Duivens. His profession was a merchant, he bought and sold steel at his house De Keyser in a street, now called Damrak. In 1567 he was against Charles de Brimeus entry in Amsterdam.
In March of that year, backed by a large part of the bourgeoisie Henry, Count of Bréderode became the Generalcaptain of the city.
A contract, who backed up that election was signed at De s house De Keyser. In the next month Brederode departed, and the Spanish General Philippe de Noircarmes became the military leader of Amsterdam, and De lost his position.
De have moved to Bruges, and from there to England, where he stayed with other exiles from Holland. De equipped a few ships, after which he joined the fleet of Lord Lumey, and took part as one of the captains in the Capture of Brielle on 1 April 1572.
Lenaert Jansz de died in exile before 1578.
Family De Together with the Republican-minded family Bicker, the De s strived for the abolition of stadtholdership. They desired the full sovereignty of the individual regions in a form in which the Republic of the United Seven Netherlands was not ruled by a single person. Instead of a sovereign (or stadtholder) the political and military power was lodged with the States General and with the regents of the cities in Holland.