The Pierre Lezin Becnel who owned Becnel Plantation - aka Evergreen Plantation was not a 'free person of color"
There are several Leo Becnels and Lezin Becnels in that time period. I believe you have crossed lines.
Leo was short for Leopold.
There are several others working on this Leo Becnel who fathered children of Olivia Brown.
It is my understanding that a Leo Becnel (white) had children with Olivia Brown (Mulatto) who later shows up as the Widow of Louis Laporte on the 1870 census as below:
1870 Federal Census of the United States, St. John the Baptist, LA Ward 1; Dwelling 72/Family 72
Laporte, Wow. Louis 30 F M
Becnel, Henry 8 M M
Becnel, Opteme 12 M M
Becnel, Marie 7 F M
And then an excerpt from a message from George Vigreux:
I am researching this family. Henri had siblings named Optime, and Marie Becnel. Their mother was Olivia Brown born abt. 1840 in Louisiana. Olivia died in June 1888 in Louisiana. Optime marriage certificate (Dec 31 1885 in New Orleans) to Mathilde Forstall, shows that his fathers name was Leo Becnel.
And a message from Dave Roberts:
It has been a few years since I have written you. I have made a few additions to my Becnel line tracing it back to Leo Becnel but I have not connected Leo to your Becnel lines. Leo's had a son, Henri, by one of his slaves Olivia Brown , Dec 8, 1860. Henri was my g-grandfather, His daughter Jeanne Michiam Becnel was my grandmother.
I wish you luck with this research. Many have tried to identify which Leo. I have been told by someone who remembers their parents talking about a Leo Becnel who had two families - one white and one black.
Again, good luck