Hi Chris,
My name is Carrie. I did research on my great grandmother in Grad school, and traced her father's line back to Philip de Penros. You may find the following helpful.
I have managed to trace the Penrose clan back to about the year 1195. This line begins with Philip de Penros (abt. 1195 Cornwall, England). He lived in Escalls, France for a time, and had three sons, Robert Penros de Escalls (abt. 1221 Escalls, France), Michael Penros de Escalls (abt. 1248 Escalls, France) and Roger de Penros (abt. 1250 Sithney, Cornwall). It appears they moved back to England between the births of Michael and Roger. Robert Penros de Escalls’ son, Roger de Penros (abt. 1250 Sithney, Cornwall) is next in line.
Roger de Penros’ son was Richard de Penrees (abt. 1278 Sithney, Cornwall), who married a woman only known as Katherine in 1296. They had seven children between 1297 and 1309, five of whom married a Vivyan, a de Bosfrancan (2), a de Botyoulen, and a Le Archer. John de Penros (abt. 1299 Penwith, Sennen, Cornwall) was Roger and Katherine’s second son, who married, Nichola Vivyan (abt. 1301 Sennen, Cornwall), around the year 1320. John and Nichola had six children between 1321 and 1329...