Marselaer was born in the city of Antwerp in 1584. He studied Law at the University of Leuven, graduating on 23 March 1611, and then made a tour of Italy.[1]
In 1613 he was admitted to the Roodenbeke lineage, one of the Seven Noble Houses of Brussels, making him a patrician of the city of Brussels. Between 1614 and 1659 he served ten terms as an alderman of Brussels, and between 1623 and 1651 seven terms as mayor.[1]
In 1617 he was knighted, and in 1622 he organized local levies to repulse Dutch raiders from Vilvoorde. In 1659 he was raised to the rank of baron.[1]
The first edition of his treatise on ambassadors was published in 1618, under the title Khpykeion, sive legationum insigne. It went into a second edition in 1626 under the title Legatus libri duo, and further editions under this title in 1644, 1663 and 1666.
Marselaer died on 7 November 1670.[1]
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