No precise "first white person" date exists, but Portuguese explorers initiated sustained European contact with present-day Nigeria in the late 15th century (1470s-1480s).
Initial exchange: European goods (textiles, beads, brass, alcohol) for pepper, ivory, palm oil, and increasingly, enslaved people. Lagos (Eko) and Benin City became major entrepôts.
Portuguese arrival began 400+ years of European engagement—trade, missionization, colonization (British, 1861-1960), and post-independence ties. The "first white man" framing obscures African agency and pre-existing global connections.