The Aemon are a race of humans from the planet Aemonus. The Aemon are descendants of the ancient Roman from Earth whose ancestors were taken from Earth by Goa'uld for several thousand years ago. Sometime before 1999, Aemon hit a plague that only affected all of male Aemon that eventually caused them to die out.
Aemon people were facing extinction, but thanks Aemon advanced recombinant genetics and artificial insemination so got Aemon female births and the population remained stable. Those female Aemon forming a planetary Senate of them named Global Senate. And in 1999 they met with their long-lost Tau'ri brethren and only became somewhat afraid of the men of SG-5, but later allied with them. (RPG: "Friends and Foes: Stargate Season Two")