Rulers
This is just a very small list with some facts about some rulers that were women.
Do they have to be queens? What about soveriegn countess or duchess?
Malika Tindu of the Jallarid Dynasty (Iraq) She ruled sometime during the 15th century, and had the khubta - Friday's prayers - preached in her name.
Queen Regnant Kukhiloko of Oahu (Hawai'i) The 11th Alii Aimoku of Oahu. She was succeeded by Queen Kalaimanuia, who reigned sometime in the 16th century at a not known time.
Queen Daroh Nanti of Sangau (Indonesia) She was princess of Majapahit and founded the state in Borneo. (time 15th century)
1406-18 Regent Dowager Queen Catalina de Lancaster of Castilla (Spain) Widow of Enrique III (1379-90-1406) she was joint regent with Fernando de Antequera for son, Juan II (1405-06-54).
1411-19 Governor and Sultan Tandu of Baghdad (Iraq) Also known as Tindu, she belonged to the Jalarid Dynasty, a branch of the Ilkhan Mongol rulers, and daughter of king Awis. She was first married to al-Zahir Barquq, the last Mamluk king of Egypt. She did not like life in Cairo and her husband let her go back to Baghdad, where she married her cousin Shah Walad bin Ali, the Governor for the Caliph, and after his death she acceded to the throne, had coins stuck in her name and the khutba (sovereign's prayer) proclaimed in her name in the mosques. She was one of the last Mongol rulers in the area.
1414-35 Queen Regnant Giovanna II d'Anjou of Napoli (Italy) and Titular Queen of Jerusalem, Cyprus and Armenia She succeeded her brother, and two years later, her second husband, Jean de Bourbon, was imprisoned after trying to seize power. She adopted Alfonso V of Aragon as her heir in 1421. After he tried to take over power in 1423, she transferred the adoption to another relative; Louis III d'Anjou, who she had expelled in 1420 for trying to seize power. After Louis' death in 1434, his brother, Rene was appointed heir, but Alfonso took power after her death.