as (a) Comunidade Autónoma Galega in Galician, and as (la) Comunidad Autónoma Gallega in Spanish (in English: Galician Autonomous Community), is composed of the four Spanish provinces of A Coruña, Lugo, Ourense, and Pontevedra. Population, main cities and languages The official statistical body of Galicia is the Instituto Galego de Estatística (IGE). According to the IGE, Galicia's total population in 2008 was 2,783,100 (1,138,474 in A Coruña, 355.406 in Lugo, 336.002 in Ourense, and 953.218 in Pontevedra). The most important cities in this region, which serve as the provinces' administrative centres, are Vigo (in Pontevedra), Pontevedra, Santiago de Compostela, A Coruña, Ferrol (in A Coruña), Lugo (in Lugo), and Ourense (in Ourense). The official languages are Galician and Spanish. Knowledge of Spanish is compulsory according to the Spanish constitution and virtually universal. Knowledge of Galician, after declining for many years owing to the pressure of Spanish and official persecution, is again on the rise due to favorable official language policies and popular support. Currently about 82% of Galicia's population can speak Galician and about 61% have it as a mother tongue. Culture Celtic revival and Celtic identity In the 19th century a group of Romantic and Nationalist writers and scholars, among them Eduardo Pondal and Manuel Murguía, led a Celtic revival initially based on the historical testimonies of ancient Roman and Greek authors (Pomponius Mela, Pliny the Elder, Strabo and Ptolemy), who wrote about the Celtic peoples who inhabited Galicia; but they also based this revival in linguistic and onomastic data, and in the similarity of some aspects of the culture and the geography of Galicia with that of the Celtic countries as Ireland, Brittany and Britain, as well as in the Bronze and Iron Age archaeological cultures. These similarities included legends and traditions, and decorative and popular arts and music. It also included the green hilly landscape and the ubiquity of Iron Age hill-forts, Neolithic megaliths and Bronze Age cup and ring marks, which were and are popularly seen as "Celtic", also among foreigners who travelled to Galicia. During the late 19th and early 20th century this revival permeated Galician society: in 1916 Os Pinos, a poem by Eduardo Pondal, was chosen as the lyrics for the new Galician hymn. One of the strophes of the poem says: Galicians, be strong / ready to great deeds / align your breast / for a glorious end / sons of the