The Rosetta Stone is inscribed with a decree regarding..?

The Rosetta Stone is an example of what is known as a “donation stele” and the decree on it proclaims the divine rulership of King Ptolemy V (as endorsed by the priesthood), details the tax exempt status of the resident priesthood, and concludes with the instruction that a copy was to be placed in every temple (inscribed in all three languages). The Rosetta Stone is a granodiorite stele, found in 1799, inscribed with three versions of a decree issued at Memphis, Egypt, in 196 BC during the Ptolemaic dynasty.