Dominis Ordinibus Provinciarum Foederis Belgici, Do[=n]is suis Clementissimis in assiduae Gratitudinis memoriam, Dant Dedicantque Adrianus Veen et Jodocus Hondius Junior.
That to be a covenant refuser is a sin that makes the times perilous; to be foederis nescius, or infoederabilis.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "foederis" in a variety of sentences. We hope that you will now be able to make sentences using this word.