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Regarding the history of Renazzo it must orient itself not before on some old press that determine the origin of the church of Renazzo in century XV and. In fact in the successive centuries to the Thousands, stable takeovers do not exist because of the bad conditions of the territory, this determining from the fact that our zone resided in what then it was a nearly common bed of the rivers Reno and Panaro. First, in particular free one from structural works to the natural course, of increased in enormous marshes, swamps or real lakes. Luigi Breventani cites in a its book of 1897 that a document of 1381 determined the zone of Renazzo like: “Place that is said Goes them Floriana or Goes them Fiorana, is between the following borders cioé: from the side of the dawn (east) along the way Floriana: and from the side of over near the “Pilastrum” and, the “Canolis Channel” (south); along the alveolus of the Old Reno from the evening side (the west); and near Casumaro from the side of under (north). ” The entire swampy zone in the centuries precedence the XIV and the territory of Malaffitto that comes cited in this document are pertaining to the diocese of Bologna. This goes them to half of century XIV already was buried because of the contribution of fluvial takeovers from the covered Reno and from that today plain scrub in least Po areas. The Reno river (from which Renazzo it takes the name) is fundamental, in fact it is own from the continuous change of the bed of this river that is born the Renazzo community. Tawny Menegatti has asserted that: “The Reno river in sec. the XIII slid along puts into effect them via Church decorator, Maestrola, Line to them, Be them n. 468 for End Emilia and Mirabello. The bank skillful of the river was placed puts into effect in it them via Church decorator, along approximately nine kilometers, this ergeva to defense of the city of Hundreds and of lands cleared and to control of waters of overwhelmed, scattered on the future dominion of the participants, in order then to lead in Panaro and to goes them of Emilia End.” Other slight knowledge on the bad territorial conditions that will give to the name to the country of Renazzo then we have they in citations of Giuseppe Landi in 1855: “the conditions in a sorry state for tinned waters will give to the unfortunate name to zones and ways like Via of Canes, the Vallazza and Renazzo that, in the gone times, thus appealed to indicate much an extensive pond formatovi from Reno, or in great ground feature overwhelmed from Arena (Arenazzo).” The dioceses are the sources of presence of territory in those centuries, in fact in century XIV it does not come absolutely cited Renazzo, must go to the half of century XV. In this century in fact the Reno, than still in 1451 passed to the west of Hundreds, continued its course between Finale and Casumaro interesting directly the territory of Malaffitto with its floods. In 1489 it was only arranged by means of banks, between Cento and the Pieve, of way that the territory was interested in way the much most marginal one to the whims of the river, this favored the takeover of rooms that could cultivate of the land. The creation of the parish of Renazzo laughed them in 1489, combined to the Pieve. This zone is connected also to the issue of the Participation, since the lands on which the parish S.Sebastiano di Renazzo will rise is own those calls of Malaffitto, than, in the late Middle Ages, rose its collective still today present. Enrico Bassanelli asserts in purpose: “The Participation is testifies fortunately to we reached through the centuries, of between many complex relationships with which the populations they contributed to the collective work of the draining of the swamps, digging channels, erecting banks against waters flowing back, conquering coltive glades from the thinning of the forests.” In this document it came specified that the owner of lands granted to entire collectivities a determined area to clear and to improve, it must and obligation sanctioned from a contract of 29 years of duration, but renew and inherit. In our case the conceding owner was the bishop of Bologna Ottaviano II Ubaldini and the concessionaire was the Hundreds communities of and Pieve of Cento. Renewed in future from Uberto bishop 23 Lawyers he arrives himself to May 1376 where, bishop Bernardo de Bonnevalle, decided to separate the municipality of Pieve from that one of Cento. The 4 june 1460 Pope Pio II exactly consented of the bishop cardinal Filippo Calandrini, this made that the lands of Malaffito could be sold, the motivations were given from the fact that these lands, because of the floodings received in past, were unproductive and therefore to yield. This document sanctioned the cession of the land of Malaffitto to the bishop for the figure of 4125 Liras, this land came divided in three parts, one of these was thought from the bishop and the others were uniforms in its turn in others 5 parts, 3 being up to Cento people and 2 to the Pieve. It is own in this document that comes for the first time name zones known like: “(...) the high way that divides the assets of said Held of Malaffitto from other lands of the men of the earth of Hundreds, near the Tower of Forcello (puts into effect it them Tower Sword) through Renazzo, and going of over near Renazzo till the place, that they call the Pilastrello. ” In the spring of the 1630 Renazzo it was hit from the plague, in autumn the brought back dead men were 48 to september, 111 to October, 43 to November diminishing towards the end of the year, also the puttinges were not executed from the parish priest as died here as a result of the plague 5 October 1630; don Tommaso Gennari. In the 1676 inhabitants they had become particularly numerous: 2638, tendency always to increase till now, thanks also to the presence of the divisible heads of that which today it comes called Participation. The 30 june 1796 arrived the first French to Hundreds, the deep transformations that were involved the civil life, political and religious dictated from revolutionary France Renazzo interested only marginally. Ended the political power of the Pope in 1859, the 11 and 12 March 1860 the voting in favor of the annexation was carried out: on 1517 enrolled and 945 voting all they voted for the union to the reign of Sardinia. Renazzo gives also the born them to don Giacomo Cassani, revolutionary ecclesiastic who in 1860 received Vittorio Emanuele II in S.Petronio to Bologna.