 This triumphal arch was built in 1765 on the occasion of the wedding of Archduke Leopold, the second son of Empress Maria Theresa and Francis Stephen of Lorraine, to the Spanish princess, Maria Luisa, on 5 August 1765.Because Leopold’s father, Francis Stephen, died unexpectedly shortly before the wedding on 18 August 1765, a memorial motif was worked into the Triumphal Arch when he died.Its south side portrays motifs of the wedding of the young couple; its north side commemorates the death of the emperor.