San Nicolás (Saint Nicolas in English) is one of the three boroughs that merged in 1423 to form the modern city of Pamplona (Iruña in Basque).
San Nicolás limits to the north with the Navarrería borough, to the south with Paseo Sarasate (Sarasate Boulevard), on the east bounds on Plaza del Castillo (Castle Square) and to the west with the Parque de la Taconera (Taconera Park).
The new borough was initially called Tencerías (from the old Romance word Tencero, Weaver).
Therefore, the king Charles III of Navarre decided to change the names of the streets in Navarrería and San Cernin.
[1] Pablo de Sarasate, a famous violinist, was born in San Nicolás Street, where a tributary plaque in his honour can be found.