Before 28th March 1133 [his father] William V Marquis of Montferrat (age 18) and [his mother] Judith of Babenburg (age 13) were married.
Aroound 1146 Conrad of Montferrat King of Jerusalem was born to [his father] William V Marquis of Montferrat (age 31) and [his mother] Judith of Babenburg (age 26).
In 1190 Conrad of Montferrat King of Jerusalem (age 44) and Isabella Anjou Queen Jerusalem (age 18) were married; see 
Ralph of Coggeshall. The difference in their ages was 26 years. She the daughter of Almaric I King Jerusalem and Maria Komnenos Queen Jerusalem (age 36).
In 1190 [his sister-in-law] Sibylla Anjou Queen Jerusalem (age 30) died. Her half sister [his wife] Isabella (age 18) succeeded Queen Jerusalem.
In 1191 [his father] William V Marquis of Montferrat (age 76) died.
In 1191 [his mother] Judith of Babenburg (age 71) died.
On 28th April 1192 Conrad of Montferrat King of Jerusalem (age 46) died.
On 6th May 1192 Henry of Champagne (age 25) and [his former wife] Isabella Anjou Queen Jerusalem (age 20) were married eight days after the assassination of her husband Conrad of Montferrat (deceased). She the daughter of Almaric I King Jerusalem and [his former mother-in-law] Maria Komnenos Queen Jerusalem (age 38). He the son of Henry Blois I Count Champagne and Marie Capet Countess Champagne (age 47). They were half third cousin twice removed. He a great x 2 grandson of King William "Conqueror" I of England.
On 5th April 1205 [his former wife] Isabella Anjou Queen Jerusalem (age 33) died.
The Deeds of the Dukes of Normandy
The Gesta Normannorum Ducum [The Deeds of the Dukes of Normandy] is a landmark medieval chronicle tracing the rise and fall of the Norman dynasty from its early roots through the pivotal events surrounding the Norman Conquest of England. Originally penned in Latin by the monk William of Jumièges shortly before 1060 and later expanded at the behest of William the Conqueror, the work chronicles the deeds, politics, battles, and leadership of the Norman dukes, especially William’s own claim to the English throne. The narrative combines earlier historical sources with firsthand information and oral testimony to present an authoritative account of Normandy’s transformation from a Viking settlement into one of medieval Europe’s most powerful realms. William’s history emphasizes the legitimacy, military prowess, and governance of the Norman line, framing their expansion, including the conquest of England, as both divinely sanctioned and noble in purpose. Later chroniclers such as Orderic Vitalis and Robert of Torigni continued the history, extending the coverage into the 12th century, providing broader context on ducal rule and its impact. Today this classic work remains a foundational source for understanding Norman identity, medieval statesmanship, and the historical forces that reshaped England and Western Europe between 800AD and 1100AD.
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Annals of Six Kings of England by Nicholas Trivet [1258-1328]. Meanwhile a ship for King Richard was prepared and all the necessities for his return were made ready. At that time he released ten of the more noble Turks in exchange for the ransom of William of Pratelles. On the feast of St Denis King Richard boarded his ships; and about the feast of St Martin, after a long tossing on the stormy sea and now weary of the voyage, he landed in the territory of the Byzantine Empire. But because he suspected the cunning of the emperor and of the Greeks, and did not wish to be recognized there, he made an agreement with some pirates whom he happened to find. After paying them the fare they demanded, he required them to carry him more quickly to a safer land. Leaving behind the royal fleet and changing his appearance so as to conceal that he was the king, he crossed with only four companions into Slavonia. From there, passing through Aquileia, he entered the land of Leopold, duke of Austria, and was captured in the city of Vienna on the thirteenth day before the Kalends of January. Duke Leopold, who hated him because of the death of the Marquis1, of which he suspected the king, threw him into prison. However, concerning that death, the prince of the Assassins, by whose men (as was mentioned above) the Marquis had been killed, cleared King Richard by a letter of the following kind.
Interea regis Ricardi navigium instruitur, et King omnia necessaria ad reditum præparantur. Tunc leaves the pro Willelmo de Pratellis redimendo, decem ex nobilioribus Turcis commutandos liberos dimisit. Die autem S. Dionysii Ricardus rex naves ascendit; et circa festum beati Martini ex diuturna tumultuantis pelagi jactatione, jam pertæsus navigationis, applicuit in terra imperii Constantinopolitani: verum quoniam suspectam habuit imperatoris et Græcorum suorum versutiam, nolens ibi videri, cum piratis forte inventis paciscens, dato quantum postulaverant naulo, exegit ab eis ut expeditius ipsum in terram commodiorem transveherent. Relicta igitur classe regia, habitu mutato se regem dissimulans, cum quatuor tantum sociis transvectus est Sclavoniam: inde pertransiens Aquileiam, cum intrasset terram Limpoldi ducis Austriæ, captus est in civitate Wienna decimotertio cal. Januarii; quem dux Limpoldus exosum habens pro morte Marchisi, de qua suspectum regem habebat, carceri mancipavit. hac tamen morte princeps Hassacenorum, a quibus (ut supra patuit) interfectus est Marchisus, regem Ricardum per litteras hujuscemodi excusavit:
Note 1. Namely, Conrad, marquis of Montferrat and prince of Tyre, whose cause Richard had espoused, the successful competitor for the throne of Jerusalem over Guy of Lusignan. The accusation alluded to in the text was preferred by the emperor, to whom Richard was sold for sixty thousand pounds of silver of Cologne weight; Roger of Wendover: "King Richard remained a prisoner of the duke of Austria till that prince sold him to the Roman emperor for sixty thousand pounds of silver, Cologne weight, and then on the Tuesday after Palm Sunday he caused him to be carefully guarded; and that he might compel the king to pay an immoderate sum for his ransom, he ordered him to be imprisoned in Treves, from which prison no one who had entered there up to that time had ever come out again,... Into this place was the king put under a strong guard of soldiers and attendants, who accompanied him wherever he went with drawn swords, day and night, and even kept guard by turns round his couch, not allowing any of his own followers to remain with him at night. None of these circumstances could ever cloud the calm countenance of the king, but he always seemed cheerful and agreeable in his conversation, and brave and daring in his acts, as time, place, cause, or person required. To others I leave the relation of his jokes to his guards; how he made them drunk, and assaulted their huge persons by way of amusement." The ruins of the castle of Tyernstein (now Dürrenstein) still exist as one of the most interesting features of the picturesque banks of the Danube, between Lintz and Vienna.
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Chronicum Anglicanum by Ralph Coggeshall. The wife1 of the marquis King Richard gave to his nephew Henry, count of Troyes, together with the kingdom of Jerusalem, for she was the heiress of the whole kingdom, her sister the queen being now dead, with King Guy of Lusignan gladly consenting to this arrangement for the sake of establishing peace. But the island of Cyprus, which he had taken from the emperor, he granted to King Guy, having received his homage.
Uxorem vero marchisii dedit rex Ricardus Henrico nepoti suo, comiti Trecensium, cum regno Hierosolymitano, utpote hæredem totius regni, sorore ejus regina jam defuncta, rege Guidone de Lezinan hoc ipsum pro pacis stabilitate libenter annuente. Insulam autem Cypri, quam ab imperatore obtinuerat, regi Guidoni concessit, accepto ejus homagio.
Note 1. Isabella Anjou Queen Jerusalem and Henry of Champagne were married eight days after her husband Conrad's murder. He, Henry, was a son of Henry I, Count of Champagne, and Marie of France, one of two daughters of King Louis VII of France and Eleanor of Aquitaine.
Chronicum Anglicanum by Ralph Coggeshall. After these things had been done, King Philip wished to hand over that city [Acre], and the other cities which were to be taken, to the marquis of Montferrat1, and to establish him as king in the land of Jerusalem, since he had married the younger daughter of King Amalric, whose sister, namely the queen, had already died. But King Richard altogether opposed this plan, asserting that it would be more just to restore the kingdom, long since despoiled, to King Guy, rather than to substitute another while he was still living, since it was clear that Guy had not lost the kingdom through cowardice or sloth, but in hard battle, when, because of the number of the enemy and the fewness of his own forces, he had been captured by the Saracens together with the Lord's Cross. This, indeed, is recognised as having been the seed of an inexorable discord between the aforesaid princes. Yet this discord had first sprouted earlier, at the city of Messina in Sicily, when King Richard had taken that city by armed force, and slain many, while King Philip was staying there, on account of the insults and vexations which the army of the king of France was inflicting on his own army.
His itaque gestis, voluit rex Philippus urbem illam, et reliquas quas capturi erant urbes, marchisio de Monteferrato tradere, eumque in terra Hierosolymitana regem constituere, eo quod juniorem filiam regis Amalarii duxisset in uxorem, sorore ejus, regina scilicet, jam defuncta. Cujus voluntati rex Ricardus prorsus obstitit; asserens justius fore regi Guidoni, regno jampridem spoliato, regnum suum restituere, quam alium, illo adhuc vivente, substituere, cum constaret hunc non per ignaviam vel socordiam regnum amisisse, sed in gravi belli certamine, ob inimicorum numerositatem ac sui exercitus paucitatem, simul cum cruce Dominica a Sarracenis fuisse captum. Quod nimirum inexorabilis discordiæ inter prædictos principes seminarium ibidem fuisse dinoscitur. Cum tamen hæc discordia primo apud Messanam Siciliæ civitatem inter eosdem pullulaverat, cum rex Ricardus eamdem urbem armata manu cepit, plurimosque prostravit, rege Philippo in ea commorante, ob convitia et vexationes quæ exercitus regis Francorum exercitui suo inferebat.
Note 1. Conrad of Montferrat King of Jerusalem had married Isabella following the death of her sister Sibylla Anjou Queen Jerusalem in 1190 and so became, jure uxoris i.e. by right of his wife, King of Jerusalem. King Richard's plan to reinstate Guy had no basis in the laws of succession since Guy was King by right of his wife who had died.