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(2) Any registration of a person as a citizen of Nigeria or the grant of a certificate of naturalisation to a person who is a citizen of a country other than Nigeria at the time of such registration or grant shall, if he is not a citizen by birth of that other country, be conditional upon effective renunciation of the citizenship or nationality of that other country within a period of not more than twelve months from the date of such registration or grant. 29. Renunciation of citizenship (1) Any citizen of Nigeria of full age who wishes to renounce his Nigerian citizenship shall make a declaration in the prescribed manner for the renunciation. (2) The President shall cause the declaration made under subsection (1) of this section to be registered and upon such registration, the person who made the declaration shall cease to be a citizen of Nigeria. (3) The President may withhold the registration of any declaration made under subsection (1) of this section if- (a) the declaration is made during any war in which Nigeria is physically involved; or (b) in his opinion, it is otherwise contrary to public policy. (4) For the purposes of subsection (1) of this section- (a) “full age” means the age of eighteen years and above; (b) any woman who is married shall be deemed to be of full age. 30. Deprivation of citizenship (1) The President may deprive a person, other than a person who is a citizen of Nigeria by birth or by registration, of his citizenship, if he is satisfied that such a person has, within a period of seven years after becoming naturalised, been sentenced to imprisonment for a term of not less than three years. (2) The President shall deprive a person, other than a person who is citizen of Nigeria by birth, of his citizenship, if he is satisfied from The Constitution of the Federal Republic of Nigeria Updated with the First, Second , Third and Fourth Alterations 39