Dark Crusader. Fourth Chronicle, #1

Akiyo is in several wars including Asian wars and roman wars. Sometimes on either side or as a servant or someone that just hangs around. In those days she could pass for any side. Akiyo is Susume the hun and later is the mother of Merlin. King Arthur pulls the sword from the stone. Akiyo is known as Aelin and many other names and fights in many medieval wars and battles. Camelot is just gone at the end of the wizard wars.
Akiyo is in more wars, Jewish wars and Tang wars. She is in the viking wars and later in all eleven crusades. Later she is in the Mongol wars, and samurai wars and eventually is trained by Musashi. Akiyo is later dragged into the war of the heavens. She is in the civil war in the US and later in WWI and WWII. Also in Korean war and Vietnam wars. Before the war's end she is in Woodstock.