As the southern region of Nigeria is composed of mostly Christians, polygamous marriages have not been legally introduced at this time. Attempts to introduce Sharia (thereby legalizing polygamy) have been made in Oyo State, Kwara State, Lagos State,[6][7] and several others, yet all unsuccessful. Polygamous unions are recognized by customary law in Nigeria, providing a handful of benefits for those in polygamous unions ranging from inheritance rights to child custody.[8]