Frans van Aerssen van Sommelsdijck was a notable Dutch diplomat and politician in the 17th century. He served as the ambassador to England and was involved in various diplomatic missions during a time of significant political change in Europe. His work contributed to the strengthening of relations between the Dutch Republic and other nations. Born in 1620, van Sommelsdijck was part of a prominent family and held various positions within the Dutch government. He played a key role in negotiations and treaties that shaped the political landscape of his time, reflecting the complexities of European diplomacy during the Thirty Years' War.