Republic of Kiribati
Formerly known as the "Gilbert Islands," part of the Gilbert & Ellice Islands Colony.
"In 1979 the Gilbert Islands, Banaba, the Phoenix and the Line Islands became the independent Republic of Kiribati. The Republic has a total land area of 810 square kilometres and consists of thirty three atolls and islands, spread across approximately a third of a million square kilometres of the Pacific Ocean, of which 21 islands are inhabited."
In most contexts, the phrase I Kiribati may be taken to mean "of or relating to the people of Kiribati." The older adjective, of course, was Gilbertese.