169 AD
Because of the treaty that was signed there. The Treaty of Limerick ended the Williamite war in Ireland between the Jacobites and the supporters of William of Orange. It concluded the Siege of Limerick in 1691.
Limerick is called the Treaty County because it was the site of the Treaty of Limerick which was signed on October 3 1691. This treaty marked the end of the Williamite War in Ireland and established a peace between the Catholic Jacobites and the Protestant Williamites. The treaty was significant in that it granted certain religious liberties to the Catholics and recognized the legitimacy of the Williamite regime in Ireland. In addition the treaty was an important step in the peaceful transfer of power between the two ruling parties. To this day Limerick is still known as the Treaty County in reference to this historic event.
The treaty was signed on the 28th June 1919.
It was signed in 1848.
The Treaty of Kanagawa was signed on March 31 in 1854 in Kanagawa. I hope this will help :-)
1957
1992
1494
it was signed in 1783 :) sOPHIA
1861
It is sometimes known as the Treaty County. Sometimes Limerick are referred to as the Shannonsiders.
CARICOM was established by the Treaty of Chaguaramas, which was signed on July 4, 1973. There are links below.