Guidonian hand
In Medieval music, the Guidonian hand was a mnemonic device used to assist singers in learning to sight-sing. Some form of the device may have been used by Guido of Arezzo, a medieval music theorist who wrote a number of treatises, including one instructing singers in sightreading. The hand occurs in some manuscripts before Guido's time as a tool to find the semitone; it does not have the depicted form until the 12th century. Sigebertus Gemblacensis in 1105–10 did describe Guido using the joints of the hand to aid in teaching his hexachord. The Guidonian hand is closely linked with Guido's new ideas about how to learn music, including the use of hexachords, and the first known Western use of solfege.
Gaelic handball
In Ireland, the earliest written record of a similar ball game is contained in the town statutes of Galway in 1527, which forbade the playing of ball games [generic] against the walls of the town. The first depiction of an Irish form of handball does not appear till 1785. On the west coast of Ireland, Galway had many trading links with Spain, especially the Basque regions, where the similar game of pelota is played. According to Dublin Handball GAA "It is highly likely that one game is derived from or influenced by the other.".