Honorius was also greatly influenced by the Popes of Rome, who sought to extend their influence through his youth and weak character.

The year 410 also saw Honorius reply to a British plea for assistance against local barbarian incursions, called the ' Rescript of Honorius '.

However, not all such grimoires of this era were based upon Arabic sources ; the 13th century the Sworn Book of Honorius for instance was, like the ancient Testament of Solomon before it, largely based upon the supposed teachings of the Biblical king Solomon, and also included ideas such as prayers and a ritual circle, with the mystical purpose of having visions of God, Hell and Purgatory, and gaining much wisdom and knowledge as a result.

He became pope on 27 October 625, two days after the death of his predecessor, Boniface V. The festival of the Elevation of the Cross is said to have been instituted during the pontificate of Honorius, which was marked also by considerable missionary enterprise.

This condemnation was subsequently confirmed by Leo II ( a fact disputed by such persons as Cesare Baronio and Bellarmine, but which has since become commonly accepted ) in the form, " and also Honorius, who did not attempt to sanctify this Apostolic Church with the teaching of Apostolic tradition, but by profane treachery permitted its purity to be polluted ".

: See also, Antipope Honorius II, otherwise known as Peter Cadalus.

One of the key ecclesiastical advisors of Lothair III was Saint Norbert of Xanten, who travelled to Rome in early 1126 to seek the formal sanction from Honorius to establish a new monastic order, the Premonstratensian Order ( also known as the Norbertines ), which Honorius agreed to do.

In 1128, Honorius ’ forces successfully captured the town of Segni, which was also held by a local baron who died during its capture.

Oderisio also mocked Honorius ’ peasant background behind his back.

Eventually, however, Honorius was able to secure not only the resignation of Oderisio, but he also excommunicated Niccolo for good measure.

Honorius also insisted that the monks take an oath of fidelity to the papacy, but they strenuously objected.

Aside from the Benedictines at Monte Cassino, Honorius was also determined to deal with the monks at Cluny Abbey under their ambitious and worldly abbot, Pons of Melgueil.

Royal pressure was also brought to bear on Hildebert of Lavardin, whom Honorius had transferred from the see of Le Mans to become the Archbishop of Tours in 1125.

Hildebert also complained to Honorius about the constant appeals to Rome whenever he made a ruling.

Honorius was also called to intervene in the affairs of Normandy, as Fulk of Anjou and King Henry I of England battled for domination.

Urban of Llandaff also travelled to Rome on numerous occasions to meet with Honorius throughout 1128 and 1129, to plead his case that his diocese should not be subject to the see of Canterbury.

Honorius also demanded that the Archbishop of Braga present himself before Honorius on the second Sunday after Easter in 1129 to answer for his actions.

Honorius also ensured that Diego should play a leading role in the Synod of Carrión ( February 1130 ), having his legate approach Diego and ask for his assistance during the synod.

Honorius also wished to promote the ongoing struggle against the Moors in Spain, and to that end he bestowed the city of Tarragona, which had been recently captured off the Moors, to Robert d ' Aguiló.

The way in which Honorius was elected meant that he became a creature, not only of Cardinal Aymeric, but also of the Frangipani family.

Honorius III also wrote a bioraphy of Celestine III ; a biography of Gregory VII ; an " Ordo Romanus ", which is a sort of ceremonial containing the rites of the Church for various occasions ; and thirty-four sermons.

Roman control of Britain finally ended in the early part of the 5th century ; the date usually given as marking the end of Roman Britain is 410, when the Emperor Honorius sent letters to the British, urging them to look to their own defence.

In 410, the Eastern Roman Empire sent six Legions ( 6, 000 men ; due to changes in tactics, legions of this period were about 1000 soldiers, down from the 6000-soldier legions of the Republic and early Empire periods ) to aid Honorius.

In 421, Honorius recognized him as co-emperor Constantius III ; however, when the announcement of his elevation was sent to Constantinople, Theodosius refused to recognise him.

To this end, Honorius " sent his deacon Gaios " to a synod in Cyprus in 634 hosted by archbishop Arkadios II with additional representatives from Patriarch Sergius I of Constantinople.

At Lothair ’ s request, Cardinal Gherardo and two bishops then sent word to Rome to obtain Honorius ’ confirmation of the election, which he granted.

Roger in the meantime had rapidly overrun the duchy of Apulia and had sent Honorius lavish gifts, asking the Pope to recognise him as the new duke and promising to hand over Troia and Montefusco in exchange.

Trying to salvage something of the situation, Honorius sent his trusted advisor Cardinal Aymeric together with Cencio II Frangipane to negotiate with Roger secretly.

Honorius sent Cardinal Gherardo as the new rector, and in 1129 visited the city again, asking that the city allow the return of those they had banished during the formation of the Commune.

Honorius, on hearing news of the disorders at Cluny, sent a legate to investigate with orders to excommunicate and denounce Pons and order him to present himself before Honorius.

Still hoping to be promoted to the office of Legate of Spain, Diego sent envoys to Rome, carrying with them 300 gold Almoravid coins, two hundred and twenty for Honorius and another eighty for the Curia.

Honorius IV appointed the envoy Archbishop of Mainz, fixed a date for the coronation, and sent Cardinal John of Tusculum to Germany to assist Rudolf I's cause.

The Mongol ruler Arghun sent an embassy and a letter to Pope Honorius IV in 1285, a Latin translation of which is preserved in the Vatican.

Boniface's partisans did not let the matter rest there and sent a petition to Emperor Honorius alleging irregularities in the election of Eulalius.

* The future Archbishops of Canterbury, Mellitus, Justus, and Honorius, and the future Archbishop of York Paulinus, are sent to England by Pope Gregory I to aid Augustine in his missionary work.

* Honorius agrees that sons of prominent families at court in Ravenna be sent beyond the Danube as hostages ; in return, later he calls up ten thousand Hun mercenaries.

* Winter – Olympiodorus, historical writer, is sent on an embassy by Honorius and sails in stormy weather around Greece up the Black Sea to meet the Huns who are located on the middle Danube ( modern Bulgaria ).

In Narbonne they are executed and their heads are sent to Honorius ' court at Ravenna.

He obtained a promise from the new pope, Honorius III, that during his lifetime no resident legate should be again sent to England, and won other concessions from the same pontiff favorable to the English Church and exalting the see of Canterbury.

Jovinus ' and Sebastianus ' heads were afterwards sent to Honorius and mounted on the walls of Ravenna ( before being passed on to Carthage, where they were put on permanent display with the heads of four other usurpers ).

Meanwhile, Honorius III sent Pelagius of Albano to lead the crusade in 1219.

Nevertheless, someone was eventually appointed and installed as the new bishop, since Pope Honorius III sent a letter directly to an unnamed Bishop of Finland in 1221.

In 625, a letter from Pope Honorius I to Metropolitan Hypatios of Nikopolis was sent with reference to the difficult travel conditions, preventing the bishop from reaching Rome.

A Roman by birth, Honorius may have been one of those chosen by Pope Gregory the Great for the Gregorian mission to England, although it seems more likely that he was a member of the second party of missionaries, sent in 601.