 As both Spanish and Quechua pronunciation have evolved since then, the Spanish pronunciation of 'z' is no longer close to the Quechua pronunciation of the consonant represented by 'z' in "Cuzco".In 1976, the city mayor signed an ordinance banning the traditional spelling and ordering the use of a new one, "Cusco", in municipality publications.Nineteen years later, on 23 June 1990, the local authorities formalized a new spelling related more closely to Quechua