Queen Searo was a member of monarchy of the Maretriarchal Confederacy in the time of Queen Belten. There was a schism in the matriarchy which left both Searo and Belten seeking the crown. Eventually, she and her followers rebelled against the confederacy and founded their own nation which became known as Searomare.
Queen Searo believed in a "uniquely ambitious vision of a society run by mares that pursued industrial perfection". Her main supporters were earth ponies.