1 Kings 2:39

And it came to pass at the of three years that two of the servants of Shimei ran away [it has been thought by some that their flight was preconcerted with their master. But the narrative does not favour this supposition] to Achish, son of Maachah, king of Gath. [This may well have been the "Achish, son of Maoch" ( 1 Samuel 21:11 ; 1 Samuel 27:2 ), to whom David fled fifty years before. Longer reigns than this are not unknown to history. Or it may have been his grandson]. And they told Shimei, saying, Behold, thy servants be in Gath.