filius nullius

noun
fi·​li·​us nul·​li·​us | \ˈfi-lē-əs-ˈnə-lē-əs, -nə-ˈlī-əs; ˈfē-lē-u̇s-ˈnu̇-lē-u̇s\

Legal Definition of filius nullius 

: an illegitimate child : bastard

called also filius populi

History and Etymology for filius nullius

Medieval Latin, literally, no one's son

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obstinately defiant of authority

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