Twelve years later , in the Treaty of Aix-la-Chapelle ( 1748 ) , Austria lost Parma , and Philip became the new Duke , founding the Bourbons of Parma .
Twelve years later , in the Treaty of Aix-la-Chapelle ( 1748 ) , Austria lost the Duchy , and Philip became the new Duke , founding the House of Bourbon-Parma .