Alessandro Scarlatti was Domenico Scarlatti’s father. Metastasio knew him, and the elder Scarlatti later set his words to music. Quantz and Hasse both came to study under him. Corelli was a colleague — both benefited from the same patronage, and seemed ready to lend each other professional assistance; Corelli certainly played Scarlatti’s music. Handel knew both in Rome, and was influenced by the two older composers.