Portugal took control of Goa in 1510. The Portuguese soon consolidated their power by imposing their own government and culture through intermarriage and converting the majority of the local population to Catholicism. Many pre-Portuguese Hindu traditions were adapted or retained by the Goan Catholics. This included a variation of the Indian caste system, although it was not practiced rigidly. Throughout the Portuguese Empire a large part of civic administration (e.g. registration of births, marriages and deaths, schools, colleges, hospitals, orphanages, etc.) was initially maintained by the Catholic religious orders. Under Portuguese nationality law, Goans born before 19 December 1961 in the then Portuguese territory of Goa are entitled to Portuguese citizenship. As per the law of Portugal ("Jus sanguinis"), this is extended up to two generations, that is to their children and grandchildren.