A poor girl with brains and a love of the library, Beryl Hutchinson's life was forever changed when she and her mother stumbled upon Sir Cyril Sheldrake, the son and former squire of the Knight. Sir Cyril had lost his father in a gruesome run-in with Springheeled Jack, and the trauma drove him to alcohol and drugs, habits which wiped out his fortune.[1] Beryl opted to help mend the broken hero, and with her help, he managed to overcome his addictions. Sir Cyril decided to take his late father's mantle for his own, and made Hutchinson his Squire. Together, they battled the many and varied supervillains of England, and later joined the international Ultramarine Corps.
Years later, when the Ultramarines' base of Superbia was taken over, and the Ultramarines (including the Knight) became brainwashed by the combined efforts of Gorilla Grodd and the Sheeda, resulting in Grodd attempting to use the Ultramarines to take over the Earth, Beryl was the only one to escape from Grodd's grip and reached out to Batman, who led the efforts to liberate Superbia from Grodd's control. Following that incident, the Juesice League banished the Ultramarines, Beryl included, to the infant universe of Qwewq, believing that the Ultramarines' own recklessness was to blame for Grodd's rampage as Grodd himself. Later, after the Ultramarines had managed to sort out problems in the infant universe, the League allowed them to return to Earth.
After the events of Infinite Crisis, Batman went on a soul-searching journey around the world, seeking to rid himself of years' worth of anger and paranoia. As part of his efforts, the Dark Knight sought to reunite the Batmen of All Nations to which Sir Cyril and his father had belonged years earlier. Sir Cyril and Beryl were naturally two of the first to sign on. The group was captured, however, by an organization called the Black Glove, and subjected to a series of death-traps. Knight and Squire survived, and the incident improved the friendship between them and Batman and Robin.
During the Final Crisis, the Ultramarines aided the heroes against the forces of Darkseid, but the Superbia base fell after sabotage by the Justifiers.
Following the death of Batman, Knight and Squire have temporarily relocated to Gotham City to help quell increasing violence. Robin has personally elected to partner with Squire (though he is quick to deny that this is due to a crush.)
The Squire III Has Not Appeared In Any Other Form Of Batman Media