Michael Collins
The term "first born" typically refers to the first child born to a set of parents and is not a standard classification for astronauts. However, if you're referring to the first group of astronauts selected by NASA in 1959, there were seven in that group, known as the Mercury Seven. If you have a different context in mind regarding "first born" astronauts, please clarify!
Amreigo Vespucci was born in Italy. Amreigo Vespucci was born in Italy. Amreigo Vespucci was born in Italy.
Berengar I of Italy was born in 845.
Adelaide of Italy was born in 931.
Bernard of Italy was born in 797.
Rozala of Italy was born in 937.
Ratold of Italy was born in 889.
Emma of Italy was born in 948.
Christopher Columbus was born in Italy.
In Italy in 1899
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Giovanna of Italy was born on November 13, 1907.