Anglesey
Mona (Anglesey) has many links with Black History eg the copper from Parys Mountain was used to "copper bottom" ships used in the Atlantic trade to speed up the ships used to transport enslaved Africans.
http://www.anglesey-today.com/copper-mountain.html
Estates on Anglesey also had links with the Slave Trade.
Also check the history of the Stapleton Cotton family of Llanfair PG who received over £6,000 after Abolition.