Proposed Canon
Mary Sagittari is an archer popped as garrison unit in Spacerock around seventeen hundred turns before Siege of Spacerock. She was popped as part of a stack of eight archers bearing the Sagittari CXIV stack name. Her sisters and brothers were called Carrie, Terry, Jerry, Perry, Harry, Gary, and Rudolfo.LIAB_Text_55
Mary stands out from her stack somewhat with her hair color - dark with a few strands of white. Some believe it may be a sign that she is destined for something greater than simply being cannon fodder.
Mary was very impressed with Countess Artemis, an archery-capable warlord, who gave them battle orders once the battle for Spacerock began. Perhaps, Mary's aspiration to become a person like Artemis will come true?
 Real World References
"Sagittarius" means "archer" ("armed with arrows and bow") in Latin. "Sagittarii" is plural for "sagittarius". "Sagittari CXIV" may refer to Roman army where units were numbered in a similar fashion.
Her name and the names of her brothers and sisters - Mary, Carrie, Terry, Jerry, Perry, Harry, Gary, and Rudolfo - may refer to reindeer drawing Santa's sleigh (particularly, Rudolf - a reindeer with a shiny nose).