The kudurru of Kaštiliašu' is a fragment of an ancient Mesopotamian narû, or entitlement stele, recording the legal action taken by Kassite king Kaštiliašu IV (ca. 1232–1225 BC) over land originally granted by his forebear Kurigalzu II (ca. 1332–1308 BC), son of Burna-Buriaš II to Uzub-Šiḫu or -Šipak in grateful recognition of his efforts in the war against Assyria under its king, Enlil-nirari. Along with the Tablet of Akaptaḫa, these are the only extant kudurrus from this king’s short eight-year reign and were both recovered from Elamite Susa, where they had been taken in antiquity, during the French excavations under Jacques de Morgan at the end of the nineteenth century and now reside in the Musée du Louvre.