In 1610 he was invited to join the elite Confrerie of Romanists, a society of Antwerp humanists and artists. A condition of admission was that the member had travelled to Rome. The diversity and high positions held by the Confrerie's membership offered him a good opportunity to meet with potential patrons.Bert Timmermans. Patronen van patronage in het zeventiende-eeuwse Antwerpen: een elite als actor binnen een kunstwereld, Amsterdam University Press, Antwerp, 2008, pp. 243–245 He was elected the dean of the painter's chamber of the Guild in 1611. Vrancx was a member and district head of the local civil militia from 1613 onwards and was in 1626 asked by the Antwerp mayor to serve a five-year term as the captain of the militia in return for a complete exemption from taxes and municipal services. The position entitled Vrancx to carry a sword. It was in a vigorous pose with a sword on his side that he was portrayed by Anthony van Dyck.
