Horseshoe arches, or keyhole arches, are particularly characteristic of what kind of architecture?

Question

What style of architecture is distinguished by extravagant ornamentation, and applies particularly to the decadent style that flourished in Italy in the 16th to 18th centuries?

Answer 1

Islamic
Examples of the arch were carved into rock in India in the first century AD. It was adopted by the Islamic caliphates, and appears in Africa and Spain from the 7th century to the 13th, and in India from the 14th century.