Marriage and children

He married three times:

• on 21 September 1610 with Pierre Hippolyte Anne de Melun, Baronesse de Caumont, died 1615
• on 28 June 1620 with Isabelle Claire de Berlaymont, Comtesse de Lalaing, died 1630
• on 29 March 1632 with Countess Maria Cleopha von Hohenzollern-Sigmaringen (1599–1685)

and had nine children, two sons and seven daughters.

The sons were :

• Philippe François, 1st Duke of Arenberg (1625–1674)
• Charles Eugene, 2nd Duke of Arenberg (1633–1681)

Arrest and death

He fell from grace in 1634, and spent the last six years of his life under house arrest in Madrid. The arrest occurred while he was on a diplomatic mission in Spain. Charged with requesting Philip IV to grant the States General of the southern Netherlands the power to negotiate a truce or peace with the United Provinces, Aarschot was sent to Spain in December 1633 as the highest-ranking member of the nobility of the Duchy of Brabant. Although initially received with great consideration by Philip IV, he was denounced four months after his arrival, accused of participating in the 1632 conspiracy to overthrow Spanish rule in the Netherlands. While admitting knowledge of the plot, he denied involvement in it and maintained his innocence. Despite letters from the Archduchess Isabella written on his behalf, Aarschot was imprisoned for some months before being placed under house arrest, in December 1634. Three years later his wife and eldest son joined him, but they were not allowed to reside in his quarters. Aarschot's depressing and restrictive circumstances brought on a debilitating disease, to which he succumbed in 1640. Shortly before his death, Philip IV sent word that his case was under review and a favorable outcome was expected; the duke was too ill to rally, however, and he died the day after receiving the king's message.