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In page Maria Amalia, Duchess of Parma:

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During this time, there were already negotiations with King Charles III of Spain, about Maria Amalia's marriage to the king's cousin, Ferdinand I, Duke of Parma. The empress hoped to strengthen her Italian influence by this union.[3][4] The marriage was supported by Maria Amalia's eldest brother, the future Joseph II, Holy Roman Emperor,[citation needed] whose first, beloved wife had been Ferdinand's sister, Princess Isabella of Parma. The marriage was part of a series of unions between daughters of Maria Theresa to members of the House of Bourbon.[4]