Editing Pope Gregory IV (section)

==Building activities and religious issues==
Gregory repaired the [[Aqua Traiana]], which had been damaged during the pontificate of Leo III.<ref>Mann, pg. 217</ref> Sometime after 841 Gregory rebuilt and fortified parts of the port of [[Ostia Antica|Ostia]] against the attacks of [[Saracens]], renaming it ''Gregoriopolis''.<ref>Mann, pg. 216; DeCormenin, pg. 219</ref> Around the same time he restored the colony of Galeria along the [[Via Portuensis]], while also establishing a new colony, called Draco, along the left bank of the [[Tiber River]], some eleven miles from Rome along the [[Via Ostiensis]]. This was the first clear example of land development undertaken by a pope within his own territory.<ref>Levillain, pg. 644; Mann, pgs. 217-218</ref>

[[File:SanMarco-Interno01-SteO153.jpg|thumb|right|The interior of [[San Marco, Rome|St Mark’s Basilica in Rome]], including the Byzantine mosaics commissioned by Gregory IV]]
Gregory contributed to the architectural development of Rome. In 833, Gregory completely rebuilt [[San Marco, Rome|St Mark’s Basilica in Rome]], adorning the walls with [[Byzantine Empire|Byzantine]]-style mosaics,<ref>Mann, pgs. 189-190</ref> as well as a number of other churches which he either repaired or rebuilt. He rebuilt the atrium of [[St. Peter’s Basilica]], and within the newly decorated chapel within the basilica he transferred the body of [[Pope Gregory I|Saint Gregory]], and from the [[Catacombs of Rome]], he moved [[Saint Sebastian]], [[Saint Tiburtius]], and [[Gorgonius|Saint Gorgonius]].<ref>Goodson, Caroline, ''The Rome of Pope Paschal I'' (2010), pg. 278</ref>  He raised the altar in the church of [[Santa Maria in Trastevere]], and founded a monastery close to the church.<ref>Mann, pg. 218</ref>

Gregory’s pontificate witnessed the end of the [[iconoclasm]] controversy in the [[Byzantine Empire]],<ref>Mann, pgs. 212-213</ref> while Gregory himself promoted the celebration of the feast of [[All Saints' Day|All Saints]] within the Frankish kingdom on both sides of the [[Rhine River]].<ref>Mann, pg. 230</ref> Gregory is also known for his appointment of Ansgar as [[archbishop of Hamburg-Bremen]] in 832, and as the apostolic legate to the northern and eastern parts of Europe.<ref>Mann, pgs. 219-220</ref> On 31 March 837 Gregory sent the [[Pallium]] to the [[archbishop of Salzburg]]; he also sent one to Venerius, the [[patriarch of Grado]], in 828, in support of his claims to have jurisdiction over the bishops of [[Istria]]. When a [[synod]] awarded jurisdiction to Maxentius, the [[patriarch of Aquileia]], Venerius appealed to Gregory, who supported him. Meanwhile, King Lothair backed Maxentius, who forced the bishops of Istria to obey him, while at the same time ignoring Gregory’s orders to cease.<ref>Mann, pgs. 222-223</ref> Gregory also supported the candidacy of [[John IV (bishop of Naples)]].<ref>Mann, pg. 224</ref>

Gregory was also asked to arbitrate during his journey to [[Francia]] in 833 the case against [[Aldric of Le Mans]], who was being forced out of his see by partisans of Lothair.<ref>Mann, pg. 226</ref> On 8 July 833 Gregory wrote to the bishops of “Gaul, Europe and Germany” declaring that Aldric had every right to appeal to the pope, and that until the pope had issued a judgement one way or the other, no-one could pass a sentence against him. Further, that this mandate had to be obeyed in order to remain in communion with the Roman church.<ref>Mann, pg. 227</ref> The letter together with the restoration of Louis allowed Aldric to remain in his see for some time.<ref>Mann, pgs. 227-228</ref>

Gregory was also asked by emperor Louis’s representative, [[Amalarius of Metz]], to provide an [[antiphonary]] for use at church services at [[Metz]], to which Gregory was forced to admit that he had none suitable for the emperor, as he had already given a number to [[Wala of Corbie]], which he had already taken to Francia.<ref>Mann, pgs. 228-229</ref>

On 25 January 844 Gregory IV died,<ref name="Levillain, pg. 644"/> and was buried in St. Peter’s Basilica. He was succeeded by [[Pope Sergius II|Sergius II]].