I've come across several instances where either someone with the last name of "King" has written an affidavit a "Lucas"; and instances of someone being referenced as "King (alias Lucas)". Any ideas as to how the Lucas and King families of Loudoun Co. VA were connected, and what would the alias mean?

For example, Anthony King was recorded in 1819 in Loudoun Co. VA with the notation “alias Lucas”; and the marriage records record Henry King (alias Lucas) married Barshaba (alias Barshaba Proctor).

I found a record where James King, "mulatto" was “…emancipated by D. King” (record location reference 1794-01, Loudoun Co. VA).
I am wondering if this James King could be the James Lucas of my family line.

No. 346 James Lucas
Loudoun County to wit

This day Wm. King personally appeared before me & made Oath that Jas. Lucas was to the best of his knowledge & belief born of free parents. Given under my hand this 10th day of September 1814
Thos. R. Mott D Clk
Loudoun County

No. 333 William Lucus – Registered 15 Nov. 1811
Loudoun County Sct.

Wm. King of Leesburg made oath that Wm. Lucas a bright Mulatto aged 23? Years the 3rd Day of this Month about 5 feet 7 Inches high, was born free as is generally reputed, that he well knows his reputed Father & Mother who considered as free, his Mother being a white woman. Nov. 15th 1811.

Sam’l M. Edwards D.C.L.C.

Any guidance would be greatly appreciated.