mater semper certa est

Also known as Mater semper certa, Mater semper certa est, pater numquam, Mater semper certa, pater numquam, Mater semper certa est, pater autem incertus, Mater semper certa, pater autem incertus

Roman-law principle which has the power of praesumptio iuris et de iure