The dialect of Vulgar Latin was common in the north-central portion of Spain this includes Castile spread throughout the region. In the 13th century when King Alfonso ruled he supported efforts such as translation of historical documents that the helped the dialect that is now known as Castilian. He wanted this to be the official language for all the people of Spain. As rulers pushed the Moors out of Spain they carried the Castilian language with them which help strengthen the Castilian language.
Castellan is Spanish, the term Castilian Spanish is used to draw a distinction between the Spanish spoken in Spain (Peninsular Spanish) and Latin American Spanish; however, this usage is somewhat misleading since Spanish speakers in Latin America
Castellan is Spanish, the term Castilian Spanish is used to draw a distinction between the Spanish spoken in Spain (Peninsular Spanish) and Latin American Spanish; however, this usage is somewhat misleading since Spanish speakers in Latin America