The Francis Pace who lived on Warwick Swamp moved to Second Swamp, not to Amelia County.He patented land on Second Swamp in 1756.Many continuing associations convincingly show that it is the same man.DNA results show he was closely related to other Prince George County Paces, i.e. Richard Pace (m. Rebecca, d. Bertie Co NC 1738), John Pace (m. Elizabeth Lowe, d. Bertie Co NC 1727), and John Pace (m. Ann Russell, d. Greenville Co SC 1825).
The Warwick Swamp records show that Francis Pace lived in close proximity not only to Peter Leath but also to Edward Woodlief, father of Sarah Woodlief Pace, and Edward Woodlief Jr, her brother.Also in the same area were Sarah Woodlief Pace's Lovesay and Ledbetter brothers-in-law, and also Richard and John Whitmore, sons of Nicholas Whitmore and Mary Pace (widow of Richard Pace d. 1677).
If you're interested in Leath associations, here are some records and reports which you might find interesting:
1 March 1743.William Aldridge, 400 acres on the N. side of Warwick Swamp and on both sides of Peter Leath's path.Patent Bk 22, p.37
10 Sep 1755.Peter Aldridge, 1244 acres between Warwick and Second Swamp adj. John Phillips, Joseph Phillips, Francis Patison, Baugh, Birchet, Gary Kirby,Butterworth, Tayler and Russell.10 Sept, 1755Lbs.5.S5200 acres being part of a pat. for 400 acres formerly grntd. Wm. Aldridge 1 Mar 1743.
10 Mar 1756.Francis Pace, 100 Acres on the south side of the Second Swamp and adj. Mountcastle and [John] Phillips.Patent Bk 32, p.688.
18 May, 1786.Aldrich, Alice, 18 ½ acres on the North side of the Second Swamp adjoining John Phillips, Joel Cheves & c.
Date unknown, Bignal Pace m. Elizabeth Chieves, daughter of Joel Chieves.
Reportedly (http://genforum.genealogy.com/lett/messages/2140.html), Peter Aldridge's daughter Lucretia married an Arthur Leath.It's not clear if this Arthur Leath was a son of Arthur Leath or of Peter Leath.
Nov 1811, PG Co, Bignal Pace named as guardian to the orphans of Frederick Aldridge, dec'd, for the benefit of Frederick Aldridge Jr.
Before 1831, James Pace [son of Bignal] m. Ann L. Phillips [daughter of John Phillips]
Nov 6 1832, Dinwiddie Co.James Aldridge m. Mary King (http://files.usgwarchives.org/va/dinwiddie/courts/dincourt.txt)
19 Jan 1837, Dinwiddie Co.James and Mary Aldridge deed to Francis Pace.