{"word_count": 200, "character_count": 1340}
During the colloquium L'acte original, entre conceptions médiévales et concept diplomatique (Nancy, 6-7 oct. 2016), we presented a paper about the practice of "insertion", which consists in transcribing an earlier document into the body of another act. This practice is used, according to the Vocabulaire international de diplomatique (International vocabulary of diplomatics), either to give legal support to this act (for example, by transcribing the powers of prosecutors or commissions), or to confer authenticity to the transcribed act, known as "vidimus". This double practice is massive in the registers of the French Royal Chancery, going as far as to produce vidimus of vidimus.Using the materials accumulated so far in the HIMANIS project, encompassing several text editions and all available inventories (despite the differences in structure),  we quantified this practice and documented its evolution from the reign of Philip IV (1286-1314) until Louis XI (1461-1483) and were able to show diachronic variation (with a maximum under the reigns of Philip IV's sons and a sharp decrease under Charles V and his successors) as well as geographic differences.We also studied the diplomatic features (beneficiaries etc.) and indications of collation (becoming quasi systematic under Philip VI) and mise en texte within the registers.