R4-H5 was an astromech droid utilized by the Nautolan Jedi Master Kit Fisto at the First Battle of Geonosis in 22 BBY. Since that battle marked the outbreak of the Clone Wars, Fisto was assigned a new droid, R6-H5, by the Jedi Order.
Behind the scenes
R4-H5 was introduced to the new Star Wars canon in "BB-8 and Other Astromech Droids," a reference book in De Agostini's Star Wars Encyclopedia series published on April 27, 2021. R4-H5 was originally created for the Star Wars Legends continuity in a 2008 Hasbro action figure pack released as part of the Star Wars: Droid Factory toy line.