The Jehoash Inscription is the name of a controversial artifact rumored to have surfaced in the construction site or in the Muslim cemetery near the Temple Mount of Jerusalem.
The inscription describes repairs made to the temple in Jerusalem by Jehoash, son of King Ahaziah of Judah, and corresponds to the account in 2 Kings chapter 12. While some scholars support the antiquity of the patina, which in turn, strengthens the contention that the inscription is authentic, the Israel Antiquities Authority has reported that the inscription is a modern day forgery.
In February 2016, Professor Ed Greenstein, Bar-Ilan University, Israel, published an update review article, The So-Called Jehoash Inscription: A Post Mortem, commenting on the various scholarly analyses of the tablet and its inscription. Greenstein, a Semitic philologist, contends that the inscription contains "anomalies—spellings and linguistic usages that did not jibe with what we know of ancient Hebrew writing and language." He also quotes paleographer Christopher Rollston for the assertion that the relative height of some letters is incorrect.
More information on the Wikipedia page  which has a discussion of the issues arising (and has tags for improvement dating back several years).