Triglav (lit. "Three-headed one") was the chief god of the Pomeranian and probably some of the Polabian Slavs, worshipped in Szczecin, Wolin and probably Brenna (now Brandenburg). His cult is attested in several biographies of the bishop St. Otto of Bamberg in the years immediately preceding his suppression of it in 1127. 
 In Latin records, this theonym is noted as Triglau, Trigelaw, Trigelau, Triglou, Triglaff, Trigeloff.
 Information about Triglav comes from three sources, the oldest being Life of Saint Otto, Bishop of Bamberg (Latin: Vita Prieflingensis) by an anonymous monk from Prüfening Abbey, written by 1146, the second source is the 1151 Life of Saint Otto, Bishop of Bamberg by the monk Ebo [de], the third is Dialog on the Life of Saint Otto of Bamberg by the monk Herbord [de], written around 1158-1159. These sources are biographies of St. Otto of Bamberg and describe his Christianization missions among the Baltic Slavs.
 Otto, after receiving permission from Pope Callistus II, goes to Pomerania to Christianize. The bishop first arrives in Wolin (according to Anonymous on August 4, according to Ebo on August 13, 1124). Anonymous describes the local cult of "Julius Caesar's spear." However, the Wolinians refuse to accept the new religion and force Otto to leave the city; he goes to Szczecin. Herbord reports that Otto, after periodically hiding in the city, began Christianization on November 1, after receiving security guarantees from Boleslav III. An anonymous monk briefly introduces the cult of Triglav and the destruction of his temple and statue: in the city there were supposed to be two richly decorated temples  (Latin: continas) not far from each other that housed images of the gods, where the god Triglav was worshipped. One of the temples held a gilded and silver-plated saddle belonging to the god, as well as a well-built horse, which was used during prophecies: several spears were spread on the ground and the horse was led between them – if the horse, steered by the god, did not touch any spear with its foot, it meant good fortune and a good prediction for the upcoming battle or journey. Eventually, on Otto's orders, the temples were destroyed and the offerings distributed to the inhabitants. The bishop single-handedly destroyed the wooden statue of Triglav, taking only three silver-plated wooden heads from the statue, which he sent to the pope as proof that the residents had been baptized. According to Herbord, there were four temples in Szczecin, including one richly decorated with paintings of people and animals, dedicated to the Triglav. Gold and silver "kraters," bull's horns decorated with precious stones that were drunk from or used as instruments, as well as swords, knives and furniture were dedicated to the god. The horse used during divination was black in color.
 
Ebo then goes on to describe how the priests of Wolin carted away the golden statue of Triglav to save it from destruction: And when the pious Otto destroyed the temples and the images of the idols, the pagan priests stole the golden image of Triglav, which they worshipped as the most important, smuggled it out of the province and delivered it to the safekeeping of a widow who lived on a modest farm, where there was no danger that anybody would come in search of it. Once they had taken this gift to her, she looked after it as if it were the apple of her eye and guarded that pagan idol in the following manner: after making a hole in the trunk of a large tree, she placed the image of Triglav therein, wrapped in a blanket and nobody was allowed to see it, much less touch it; only a small hole was left open in the trunk through which to insert the sacrifice and nobody entered that house unless it was to perform the rituals of the pagan sacrifices [...] And thus, Hermann bought himself a cap and a tunic in the Slavic style and, after many dangers along a difficult road, when he reached the house of that widow, declared that he had not long since succeeded in escaping from the tempestuous jaws of the sea thanks to the invocation of his god Triglav, and that he therefore wished to offer him the sacrifice promised for his salvation and that he had arrived there, led by him, following a miraculous order through unknown stretches of the road. And she says: “If you have been sent by him, I have here the altar which contains our god, enclosed in the hole made in an oak. You may not see him nor touch him, but rather, prostrating yourself before the trunk, take note from a prudent distance of the small hole where you must place the sacrifice you wish to make. And after offering it, once the orifice is reverently closed, go and, if you value your life, do not reveal this conversation to anybody”. He entered joyfully in that place and threw a silver drachma into the hole, so that it would appear, from the sound of the metal, that he had offered a sacrifice. But after throwing it in, he took back out what he had thrown and, by way of homage to Triglav, he offered him a humiliation, specifically, a large gob of spit as a sacrifice. Afterwards, he looked carefully to see if there was any possibility of carrying out the mission for which he had been sent there and he realised that the image of Triglav had been placed in the trunk so carefully and firmly that it could not be taken out or even moved. Whereby, afflicted by no small sorrow, he asked himself anxiously what he should do, saying to himself: “Woe! Why have I travelled so fruitlessly such a long journey by sea! What shall I say to my lord or who will believe that I was here, if I return empty-handed?” And looking around him, he saw Triglav’s saddle hanging nearby on the wall: this was extremely old and now served no purpose and, immediately rushing towards it, he tears the hapless trophy off the wall, hides it and, leaving in the early evening, he hurries to meet up with his lord and his men, tells them what he had done and shows Triglav’s saddle as proof of his loyalty. And thus, the Apostle of the Pomeranians, after holding council with his companions, came to the conclusion that that they should desist in their undertaking, unless it should appear that they were driven less by a zeal for justice than by a greed for gold. After summoning and gathering the tribal chieftains and the elders, they demanded, by means of a solemn oath, that they abandon their cult to Triglav and that, once the image was broken, all of its gold would be used to redeem captives.
 Otto then demanded that the inhabitants abandon the cult of Triglav. Then Otto established two Wolin churches: one in the city, dedicated to St. Adalbert and St. Wenceslas, and the other outside the city, large and beautiful, St. Peter's Temple. On March 28, 1125, Otto returns to his Archdiocese of Bamberg.
 
Soon afterwards, some Wolinians and Stettinians returned to their native faith, as Ebon describes: in Wolin, the inhabitants, after burning idols during the first Christianization mission, began to create new statues decorated with gold and silver, and celebrated the feast of deities. For this, the Christian God was to punish them with fire from heaven. He further states: Stettin, a big city, larger than Wollin, had three hills in its jurisdiction; the middle one of these, which was also the highest, was dedicated to Triglav, the most important god of the pagans. Its statue had three heads and its eyes and lips were covered with a golden bandage. About the idols, the priests said that their most important god had three heads because it ruled three kingdoms, namely, heaven, earth, and hell, and that its face was covered with a bandage so that it might ignore the sins of men as it did not see them and was silent.
 There was once an epidemic in the city, which the priests believed was sent by the gods as punishment for abandoning their faith, and that they should start offering sacrifices to the gods if they wanted to survive. Since then, pagan rituals and sacrifices began to be performed again in Szczecin, and Christian temples began to decline.
 In April 1127, Otto returns to Pomerania to continue his Christianization mission. In May and June, he carries out Christianization in Wolgast and Gützkow, and on July 31 he returns to Szczecin. Further, Ebon and Herbord report that pagan places of worship were destroyed, and that Christianization continued.
 It is possible that the cult Triglav was mentioned by the 13th-century writer Henry of Antwerp [de], who was well informed about the battles for Brenna in the mid-12th century, according to whom a three-headed deity was worshipped in the stronghold, but he does not give its name.
 Some authors believe that Adam of Bremen's information about "Neptune" worshipped in Wolin may refer to the Triglav.
 Scholars have tried to find any references to the Triglav beyond the Polabia and Pomerania. In this context, Mount Triglav in Slovenia and the legend associated with it are often mentioned: "the first to appear from the water was the high mountain Triglav", although Marko Snoj, for example, found the mountain's connection to a god unlikely. Aleksander Gieysztor, following Josip Mal [Wikidata], cites the Triglav stone near Ptuj, whose name was mentioned in 1322.
 There is a village Trzygłów in Poland, but it is within the range of the Szczecinian cult. In western-northern Poland, folklorists have collected a number of local legends, according to which the statue of Triglav taken from Wolin was supposed to be hidden in the village of Gryfice, in Świętoujść on Wolin, in Tychowo under the erratic boulder Trygław, or in Jezioro Trzygłowskie [pl] ("Trzygłów's Lake").
 The Hill on which Szczecin's temple to Triglav was located is most likely identical to Castle Hill. At the top of the Hill there was supposed to be a circle surrounded by a ditch, which was originally a sacred circle (from the 8th century), later a temple of Triglav was built there, and later a Christian temple.
 Brandenburg's Mound of Triglav is located about 0.5 kilometers from the fortress located on the island. A bronze horse, iron and decorative objects, including a lot of pottery, were discovered in the stronghold, indicating its importance and that an extensive religious cult may have been associated with it.
 According to Aleksander Gieysztor, it should be considered that Triglav was a tribal god, separate from Perun, as indicated by Herbord's information that in Szczecin, in addition to temples, the place of worship included an oak tree and a spring, which are attributes of the thunder god. Gieysztor recognizes that Triglav was a god close to the chthonic Veles. According to him, this interpretation is supported by the fact that a black horse was sacrificed to Triglav, while Svetovit, interpreted by him as a Polabian hypostasis of Perun, was sacrificed to a white horse.
 Andrzej Szyjewski also recognizes Triglav as a chthonic god. He mentions the opinions of some researchers that the names Volos (veles), Vologost, Volyn and Wolin are related to each other, and Herbord's information that "Pluto" – the Greek god of death – was worshipped in Wolin.
 According to Jiří Dynda, Triglav may have been a three-headed god who combined the three gods responsible for Earth, Heaven, Underworld. In doing so, he cites the pass of "Neptune" worshipped in Wolin and links this to Slovenian traditions regarding Mount Triglav, a three-leveled idol from Zbruch, a Wolin's sacred spear attached to a pole, and an oak tree with a spring which, according to Dynda, corresponds to the Norse Yggdrasil and the wells beneath it, and the hiding of the god's statue in the tree  all of which are said to be connected to the Axis mundi. Dynda proposes the following interpretations:
 According to Henryk Lowmianski, the Triglav originated in Christianity – in the Middle Ages the Holy Trinity was depicted with three faces, which was later taken over by pagans in the form of a three-headed deity. However, this view cannot be accepted, since the depiction of the Holy Trinity with three faces is attested only from the 14th century, and the official condemnation by the Pope from 1628. The depiction of the Holy Trinity with three faces itself may be of pagan origin (Balkans).
 According to Stanislaw Rosik, Christianity may have influenced the development of the Triglav cult in its declining phase. The significance may have been that for the Slavs the Christian God was a "German god," associated with a different ethnic group, but known from neighborly contacts and the later coexistence of the cult of Jesus and the Triglav (the so-called "doublefaith"). As pagans understood it, they linked the power of the deity to the military-political strength of the tribe in question, so the Pomeranians reckoned with a new deity, and the monolatrous (or henotheistic) worship of Triglav may have fostered his identification with Jesus on the basis of interpretatio Slavica. Such an alignment of religiosity fostered a later highlighting of the separateness of Jesus and Triglav, in accordance with Christian theology, and further demonization of Triglav after the final christianisation of Pomerania, which perhaps finds an outlet in the 15th-century Liber sancti Jacobi, where Triglav is referred to as "the enemy of mankind" and "the god or rather the devil."