Old French sentential negation (NEG) represents an important morphosyntactic change that has been investigated by a large number of scholars from different theoretical approaches. From the 12th to the 14th (and mainly in the 13th) century, there are two variants of this variable in competition: NEG with only ne (the older variant) and NEG with ne + pas/mie/point, etc. The research presented in this paper has been motivated by the wish to find relevant factors for this variation in Old French. In order to identify factors of influence on the variable NEG with or without pas, mie and point, we analyse two subcorpora containing two different text types. The choice of the tested factors is rooted both in variational linguistics and in previous studies on Old French negation, implying (extralinguistic) diasystematic factors like diatopic and diastratic ones as well as intralinguistic factors like transitivity of the verb, word order and clause type. Main findings are the probable relevance of clause type and the influence of socially definable (diastratic) groups. Beyond this, the results across the two different text type are predominantly similar, but we found differences as well. This leads us to plead in favour of the importance of considering the factor text type while working on diachronic corpora.