Johannes Dominicus, an excellent astronomer, born at Piedmont in 1635; died at Paris in 1712. For the history of his observations and discoveries, see article Astronomy, pp. 802–3.

Cassini, James, the only son of the former, was born at Paris in 1677, and died in that city in 1756. See article Astronomy, pp. 805–6.

Cassini, de Thury, Cesar Françoise, was the second son of James Cassini, and was born in 1714, at Paris, where he died in 1784. See article Astronomy, pp. 805–6.