and Campidanese Sardinian were beginning to appear, Wagner found in this period "the original unity of the Sardinian language". In agreement with Wagner is Paolo Merci, who found a "broad uniformity" around this period, as were Antonio Sanna and Ignazio Delogu too, for whom it was the islanders' community life that prevented Sardinian from localism. According to Carlo Tagliavini, these earlier documents show the existence of a Sardinian Koine which pointed to a model based on Logudorese. According to Eduardo Blasco Ferrer, it was in the wake of the fall of the Judicates of Cagliari and Gallura, in the second half of the 13th century, that Sardinian began to fragment into its modern dialects, undergoing some Tuscanization under the rule of the Republic of Pisa; it did not take long before the Genoese too started carving their own sphere of influence in northern Sardinia, both through the mixed Sardinian-Genoese nobility of Sassari and the members of the Doria family. A certain range of dialectal variation is then noted. A special position was occupied by the Judicate of Arborea, the last Sardinian kingdom to fall to foreign powers, in which a transitional dialect was spoken, that of Middle Sardinian. The Carta de Logu of the Kingdom of Arborea, one of the first constitutions in history drawn up in 1355–1376 by Marianus IV and the Queen, the "Lady Judge" ( in Sardinian, in Catalan, in Italian) Eleanor, was written in this transitional variety of Sardinian, and would remain in force until 1827. The Arborean judges' effort to unify the Sardinian dialects were due to their desire to be legitimate rulers of the entire island under a single state ( "Sardinian Republic"); such political goal, after all, was already manifest in 1164, when the Arborean Judge Barison ordered his great seal to be made with the writings ("Barison, by the grace of God, King of Sardinia") and ("The people's rule is equal to the Sardinians' own force"). Dante Alighieri wrote in his 1302–05 essay De vulgari eloquentia that Sardinians were strictly speaking not Italians (), even though they appeared superficially similar to them, and they did not speak anything close to a Neo-Latin language of their own (), but resorted to aping straightforward Latin instead. Dante's view on the Sardinians, however, is proof of how their language had been following its own course in a way which was already unintelligible to non-islanders, and