A more thorough explanation:

PRO PARTE LEGITIMUS, PRO PARTE ILLEGITIMUS

Pro parte legitimus, pro parte illegitimus means partly legitimate and partly illegitimate. In Roman and civil law, a child born out of wedlock could be later legitimized through the marriage of the child's parents. However, in England, this legitimate status was not fully recognized.

An example of pro parte legitimus, pro parte illegitimus would be a child born out of wedlock whose parents later got married. The child would be considered partly legitimate and partly illegitimate. In Roman and civil law, the child would be legitimized, but in England, the child's legitimate status would not be fully recognized.

Another example would be a child born to a married couple, but the father is not the biological father. The child would be considered partly legitimate and partly illegitimate. The child would be legitimate in terms of being born to a married couple, but illegitimate in terms of not being biologically related to the father.

These examples illustrate how a child's legitimacy can be affected by their parents' marital status and biological relationships. Pro parte legitimus, pro parte illegitimus recognizes that a child's legitimacy is not always straightforward and can be influenced by various factors.