The flag of Nigeria was designed by Taiwo Akinkunmi and was officially adopted to represent Nigeria at midnight on 1 October 1960, the day the country gained independence. The flag was chosen as part of a nationwide open contest held by the government, with Akinkunmi's design being selected as the winner of a field of over three thousand entries. The flag is a vertical bicolour green-white-green design, with green representing agriculture and white representing peace and unity.

The flag was raised for the first time in a ceremony by Lieutenant David Ejoor of the Army Guard. Wikipedia