Indirect rule in Northern Nigeria was introduced by Lord Lugard (Sir Frederick Lugard), who served as the High Commissioner of the Protectorate of Northern Nigeria from 1900 to 1906, and later as the Governor-General of Nigeria from 1914 to 1919.
Indirect rule was a system of colonial administration in which the British governed through existing traditional rulers and indigenous political institutions rather than replacing them with entirely new structures. In Northern Nigeria, this system worked particularly well because the region already had a well-established hierarchical political structure under the emirs and the Sokoto Caliphate. The emirs collected taxes, administered justice through Islamic courts, and maintained order on behalf of the British, while British Residents supervised and guided their activities.
Lugard favoured this approach because it was cost-effective (requiring fewer British personnel), reduced the risk of rebellion (by preserving familiar authority figures), and allowed governance of a vast territory with limited resources. He later attempted to extend the system to Southern Nigeria with mixed results.
Sir Arthur Richards was a later Governor of Nigeria (1943-1948) known for the Richards Constitution of 1946. Sir John Macpherson succeeded Richards and introduced the Macpherson Constitution of 1951. Lord Harcourt served as Secretary of State for the Colonies but did not introduce indirect rule in Nigeria.
The correct answer is Lord Lugard, the architect of indirect rule in Northern Nigeria.