At Kaimakli Cayo (or Cello) – two possible origins. According to one version, it comes from the Gascon word calhaus ("cobblestone"), and the second from the surname of a noble family of Cello, some of whose members even became mayors of Bordeaux in the XIII-XV centuries.

Gate Cayo is located a few minutes walk from the Cathedral of St. Andrew. In the Middle ages, this gate was the main entrance into the city. The road on which they stood, was led to the Palace, which was the residence of the Dukes, and then took place the meeting of the city Parliament. At the end of XVI and XVIII centuries, the Palace burned down several times. At the turn of the nineteenth century, it was decided not to restore, and finally to demolish and build in its place an area called the Palace.

Gate Cayo were built to commemorate the victory that king Charles VIII won in 1495 of the Italian army in the battle of Fornovo. The gate is decorated with several statues, including the statue of Charles VIII. Also near the gate there are the statues of St. John the theologian and the Archbishop of Bordeaux, cardinal d Aparna, who was also present at the battle and was in the Royal rate.

Despite clear signs of defensive structures that are present in the appearance of the gate (loopholes, Dormer Windows, jagged protrusions and lattice), the image can be seen more elegant, architectural ornaments and decorative arches, graceful turrets, a medallion in the form of a coat of arms with lilies, which is supported by two angels. The architectural style of the gate Cayo combines elements of both Gothic and Renaissance. The height of the gate with a spire on the Central tower is 35 meters. In 1822 was carried out the restoration of the gate, during which non-restoration of the bas-reliefs were removed and placed in the Museum of Aquitaine.

In 1883 gate Cayo were awarded national historic landmark.