In recent news, it was announced that Turkey agrees to return to the Land of Israel the "Siloam inscription" (see it in Times of Israel). What is it about? How important is this item?
The Siloam inscription was found in an underground tunnel dug in the times of King Hezekiah before the forthcoming Assyrian invasion and siege to Jerusalem, the capital of the Kingdom of Judea. The year of construction was probably a few years before 701 BCE when the Assyrian invasion actually took place. It is mentioned in the Bible in two occurrences:
Now the rest of the acts of Hezekiah, and all his might, and how he made the pool, and the conduit, and brought water into the city, are they not written in the book of the chronicles of the kings of Judah? -- 2 Kings 20:20