June, 1444
1st Portuguese Slave Raid
Mauritania
Arguin Bay
Having acquired their license, the Lagos company equipped a fleet of six slave ships and about thirty men that set out for the Arguin banks in the spring of 1444.
https://en.wikipedia.org/wiki/Lan%C3%A7arote_de_Freitashttps://ldhi.library.cofc.edu/exhibits/show/africanpassageslowcountryadapt/introductionatlanticworld/trans_atlantic_slave_trade