Prossa, of the Ginkasquao

Prosser Name Meaning Welsh: Anglicized form of Welsh ap Rhosier ‘son of Roger’ (see Roger).

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http://www.freeafricanamericans.com/Gibson_Gowen.htm

Michael1 Gowen, born say 1635, was the "negro" servant of Christopher Stafford who gave him his freedom by his 18 January 1654 York County will after four years of service. Accordingly, Stafford's sister Amie Barnehouse discharged "Mihill Gowen" from her service on 25 October 1657, and she gave him his child William, born of her "negro Prossa" [DWO 3:16].

Excerpt from the great info on these family members under the Discussion tab:

While a servant in the Stafford household Mihil had a son of a Kimbundu African slave named Pallassa (also known as Prossa). When released from indentureship Mihil was allowed to take his son, William Gowen with him. Source: Children of Perdition Melugeons and the Struggle of Mixed America Tim Hashaw 2006/7 pg 27. Mihil purchased land in James City County and took a white woman as wife and they had three mulatto sons who they named: Daniel, Christopher and Thomas Gowen.