Abstract: (On the variety of arguments used when building the very first set of Romanian grammar norms) Our paper aims to emphasize some concrete examples for the creation of grammatical norm in the first ever published grammar book on Romanian language: Elementa linguae daco-romanae sive valahicae. The authors, Samuil Micu and Gheorghe Șincai, provide several arguments to justify their option. Some of them refer to the cultural prestige (the Latin model, the etymology argument, the comparison with other European languages), while others point either to the tradition of spoken language, or to the simple application of the minimum effort rule. On several occasions the authors are compelled to take their own decisions, due to lack of clear diachronic or synchronic evidence. Despite being a descriptive grammar, Elementa aimed first and foremost to provide fix and unified norms of proper communication, which would have enabled Romanian language to be considered amongst other cultivated languages in Europe. This fact is underpinned by the variety of arguments provided to support and legitimize the employed rules.