Ya'qubi in the context of "Kaduna State"

Kaduna (Hausa: Jihar Kaduna, جىِهَر كَدُنا; مدينة كدونا; Fula: Leydi Kaduna, 𞤤𞤫𞤴𞤣𞤭 𞤳𞤢𞤣𞤵𞤲𞤢; Tyap: Si̱tet Ka̱duna) is a state in the northwest geopolitical zone of Nigeria. The state capital is its namesake, the city of Kaduna, which was the 8th largest city in the country as of 2006. Created in 1967 as North-Central State, which also encompassed the modern Katsina State, Kaduna State achieved its current borders in 1987. Kaduna State is the fourth largest and third most populous state in the country, Kaduna State is nicknamed the Centre of Learning, owing to the presence of numerous educational institutions of importance within the state such as Ahmadu Bello University, Nigerian Defence Academy, Air Force Institute of Technology (AFIT), Kaduna Polytechnic, etc.

Modern Kaduna State is home to the sites of some of Africa's oldest civilizations, including the Nok civilization that prospered from c. 1500 BC to c. 500 AD. In the 9th century, geographer and historian Ya'qubi documented the existence of the Hausa Kingdoms, which existed until the region was incorporated into the Sokoto Caliphate in the early 1800s. During the colonial era, the city of Kaduna was made the capital of Northern Nigeria Protectorate by British leadership.