In Roman times, the island was known as "Pausoa", the Basque word for passage or step. Then the French translated this as "Paysans", meaning peasant, before transposing it as "Faisans", for pheasant. Over time, the name Île des Faisans stuck.

The humble island finally came into prominence in 1648, following a ceasefire at the end of the Thirty Years' War between France and Spain, when it was chosen as a neutral space to demarcate the new borderlands. In fact, 24 summits took place, with military escorts on standby should talks breakdown. Eleven years later, the Treaty of the Pyrenees peace accord was struck.

To honour the occasion, a royal wedding was mooted, and, in 1660, French King Louis XIV married the daughter of King Philip IV, Maria Theresa of Spain, on the spot of the declaration. Wooden bridges were built to ease passage, royal parties arrived in state barges and carriages, and tapestries and paintings were commissioned. Diego Velázquez, court painter to Philip and whose magnum opus remains Las Meninas (a portrait of Margaret Theresa with her maids of honour) was put in charge of arranging much of the festivities.

So symbolic was Pheasant Island as a metaphor of peace, in fact, that it was decided both countries would have joint custody of the territory. Spain would hold stewardship from 1 February to 31 July each year, while Pheasant Island would become an official part of France for the other six months. In that moment, the world's smallest condominium was born.

By definition, condominiums are places determined by the presence of at least more than one sovereign state. The sense is derived from Latin, with "com" implying "together" and "dominium" meaning "right of ownership". And over the centuries, numerous countries have become embroiled in geographic tug o' wars over condominiums, with governments spending decades happily arguing the finer points of who owns what and why. Most aren't centres of empire, but rather experimental, geopolitical addendums.

At least for now, there are eight in the world, including Lake Constance, the tridominium between Austria, Germany and Switzerland; the Brčko District shared by Bosnia and Herzegovina; and the disputed territory of the Republika Srpska. Then there is the Joint Regime Area, a shared maritime zone between Colombia and Jamaica; and the Abyei Area contested by South Sudan and Sudan.

Another is the Moselle river and its tributaries the Sauer and the Our – a riverine condominium shared between Germany and Luxembourg; while the Gulf of Fonseca is a tripartite condominium portioned up by Honduras, El Salvador and Nicaragua. Antarctica is the last but also the largest and most momentous, a theoretical continental condominium, governed by the 29 signatories of the Antarctic Treaty that have consulting status.

On the day of my visit to Pheasant Island, the territory was in the hands of the Spanish. A group of kayakers was exploring its nooks from the water, and, on land, only one passer-by stopped to take photographs. Besides administering the gardening, maintaining the boat landing site, discussing fishing rights and monitoring the water quality, there isn't much for the Spanish to do on a month-to-month basis. Visitors are only allowed onto the island on rare occasions: either on one of the bi-annual handover days, when the island is abuzz with activity during the official ceremony, with flags, delegates, diplomats and plenty of formal pomp; or as part of ad-hoc, occasional heritage tours.