In 1489 a great trade agreement, that would last for 96 years, united the kingdoms of Spain and England with the reduction of trade tariffs, the recognition of France as a common enemy, and the marriage of Catherine of Aragon to King Henry VII's son, Prince Arthur (and later to King Henry VIII)—this was known as the Treaty of Medina del Campo (1489).

[2] The fair of Medina del Campo featured a notable presence of international dealers, chiefly Castilian, Portuguese, Italian (Genovese, Milanese and Florentines) and Flemish, as well as also some French, English and German merchants.

The city experienced a deep transformation in its social fabric during the early 17th century, through a process of ruralization that increased the proportion of the populace employed at the primary sector.

Also adding to the growth were the strong commercial sector, such as the furniture trade or the opening of shops on Sundays (which is not customary in Spain), and finally proximity of quality wines with the Denominación de Origen of Rueda.

These buildings were promoted by rich merchant bankers who prospered thanks to the General Fair of the Spanish Kingdom held in Medina del Campo during the 15th and 16th centuries.

Medina del Campo was founded on the hill called La Mota in the 11th century, in the same place where the Castle is, and remains of a wall still survive.

In addition, this hill has archaeological remains such as a stronghold, a medieval village and a Celtic walled settlement dated from the 4th century BC (Iron Age).

The greater chapel has large dimensions, with Gothic ribbed vault roof and an interesting altarpiece dated from the 16th century.

In the choir, which is in the west facade, we can admire the magnificent baroque organ, dated from the 18th century, a recently restored masterpiece.

This is an ancient market-hall, in Spanish called Mercado de Abastos, on the left bank of the Zapardiel brook, was built under the Catholic Monarchs in 1500 in Renaissance style.

Whereas the financiers settled in Padilla Street, the other merchants were distributed in the Main Square according to Ordenanzas de Feriantes (Lodging Ordinances).

The most important episode was the will and death of Isabel la Católica (Queen of Castile), 26 November 1504 (for this reason it is also called Palacio Testamentario, Testamentary Palace).

The Palace was started in the 14th century and was enlarged both by Don Fernando de Antequera (Lord of Medina del Campo and, afterwards, King of Aragon), as well as by the Reyes Católicos.

The Holy Week has been officially declared a Tourist Attraction, because of the artistic value of his religious images and the documented antiquity of its processions.