British GIbraltar was created in 1713.
Yes
By the Treaty of Utrecht in 1713
Spain
Gibraltar is the British Overseas Territory located at the southern tip of the Spanish mainland. It has been a British territory since the Treaty of Utrecht in 1713.
Gibraltar is a British possession.
Gibraltar is a British Overseas Territory. It was ceded to Britain under the Terms of the Treaty of Utrecht in 1713 at the end of the war of Spanish succession. Under this treaty Spain lost most of her European empire.
The United Kingdom. However, there is a dispute with Spain that sovereignty should be theirs. The people of Gibraltar voted in 2002 to reject Spain's rule. Since 2006, Gibraltar has governed its own affairs, though some powers, such as defence and foreign relations, remain under UK responsibility. Gibraltar remains a British overseas dependent territory.
The "rock" you inquired about is the British self governing territory of Gibraltar. Spain ceded the territory to Britain with the Treaty Of Utrecht in 1713.
Gibraltar guards the western entrance to the Mediterranean Sea so was militarily essential for the British Empire to ensure security for their middle east assets.
1713 = 1,713
I believe that Gibraltar is the only territory to have remained a British possession since 1713. The Spanish garrison at Gibraltar was captured by the British in 1704 and ceded to Britain under the terms of the Treaty of Utrecht in 1713. However, whether it should be regarded as a country is debatable because it would simply be reabsorbed into the rest of Spain if the British were to withdraw. Spanish attempts to regain the region by force were unsuccessful and since 1783 have pressed for a peaceful and negotiated return of "The Rock". This has been rejected by every British government as Gibraltar's strategic value at the entrance to the Mediterranean continued to grow. In the 1960's a referendum of the population produced a majority in favour of remaining a British Territory. The reaction from Spain was to close the border which remained closed until 1985. More recently there have been Anglo-Spanish talks on a proposed joint sovereignty of the territory but this was subsequently rejected in another referendum by 98.5% of Gibraltar's population! The Pimpernel