Sorry, I was only going with their name: https://en.m.wikipedia.org/wiki/Muhammad_ibn_Musa_al-Khwarizmi https://en.m.wikipedia.org/wiki/Muhammad_ibn_Musa_al-Khw

Sorry, I was only going with their name: https://en.m.wikipedia.org/wiki/Muhammad_ibn_Musa_al-Khwarizmi https://en.m.wikipedia.org/wiki/Muhammad_ibn_Musa_al-Khwariz... I was hoping 9th century mention would give it away though.