Worship of these Princes is deeply entwined with Imperial culture, either due to their aspect or due to a history of involvement in Imperial life - some of them were known to the Nedes since before the Ayleid Hegemony. It is not uncommon for people to publicly declare their faith in these Princes, and often their place in society is regulated by large, public displays of religiosity, festivals and shrines. They are uncontroversial.
Popular throughout Cyrodiil. Vile is the patron spirit of commerce, and the embodiment of pragmatic, amoral and realistic methods in business and politics – as such, he is often connected to Zenithar. Markets and commercial places are often indicated by the Mark of the Dog, and small (purely decorative) shrines to Vile can be found along major trade roads. Vile encourages trade, and it is believed that he protects the pious merchant from bandits and natural disasters. Vile's "official" cult overlaps heavily with the various trade organizations of Cyrodiil, like the various merchant cooperatives, or the East Empire Company.
A large, prosperous shrine to Vile can be found west of the village Weye, along the great Yellow Road - this shrine is publicly known, indicated on all the maps, and not in any way persecuted. Here, the east-west and north-south trade intersect, and a large, semi-permanent tent city and market have arisen. The market's self-governance is an ancient tradition, bought each year with lavish tribute to the government. It is policed by the Claviculaes, a commercial sect.
Clavicus is also worshiped by Cyrodiil's native vampires, though he shares their allegiance with Molag Bal.
Very popular among the Empire's intelligentsia. In the Arcane University, clubs, fraternities and other social pastimes are traditionally under the auspices of Mora (whereas the more scholarly activities are dedicated to Magnus). Mora also has a more serious cult dedicated to him, based in an old library-fortress in the northern Colovian Highlands, above the snow-line. This cult employs a secret network of spies and agents within all the large institutions of knowledge in Cyrodiil and only recruits its members from these institutions.
In practice, the PC can only become a member of this cult by first joining the Mages Guild or a similar knowledge-based organization (Order of Julianos?)
The lackluster efforts of the Imperial Cult when it comes to the poor have driven many to seek the favor of Namira instead: while she does not offer a way out of despondency, she offers respect and acceptance for their lot and their person. While the Empire's upstanding citizens (especially the middle class of merchants and artisans) often object to the legality of this cult, it is tolerated, as it is believed to pacify the lower classes.
The actual cultists of Namira are strange, ascetic figures, wrapped in threadbare black robes, wearing strange hoods that cover their faces entirely (a Namirite has no use for his eyes). They live in slums, sewers, lightness caves and ruins, the margins. They practice a lethargic, nihilistic, but non-violent philosophy, which claims that all of life and existence is a random mutation, come forth from the primordial darkness of Namira, in which it all will one day dissolve again. The best thing one can do is try to rejoin the Scuttling Void ahead of this time, by meditating in the darkness. Namirite ascetics usually avoid the cities, though one or two can reliably be found in the slums and sewers.
Patron spirit of thieves and instrument makers. Worship of Nocturnal is in the hands of a subset of priest-thieves in the Thieves Guild, and should be discussed in relation to them. One exception is the makers of musical and magical instruments, who believe that their creations are inspired by visions of Nocturnal's sphere.
Quests concerning Nocturnal are only available to members of the Thieves' Guild.
The False-Worm. As king of the Low Order, Peryite has a dedicated following in the many accountants, lawyers and administrators of Cyrodiil. His main cult doubles as the Guild of Barristers in the Imperial City. Peryite plays an important role in the non-magical education of the Imperial people, and is credited with teaching primeval men of the number zero, as well as several other mathematical concepts. The Order of Akatosh dislikes him.
One of the Empire's most popular Princes. Sanguine is the patron of debauchery and hedonism, and his visage can be seen on the signs of gambling dens and lower-class whorehouses across Cyrodiil (that is to say, those that are not claimed by Dibella).
The inhabitants of the Imperial City feel a special bond with this jovial Prince: it is said that Sanguine once lodged in the Emperor's Palace, and that his influence can still be felt across the city, manifesting in the lustrous red roses that the city is known for. The city's citizens celebrate him as the "Rubicund King" in an annual festival, during which normal laws of decorum are suspended: citizens take to the streets in cheap paper goat-masks, drinking, partaking in illicit substances, and visiting the city's arena, which organizes a blatantly illegal tournament around this time (arena fighters are known as Sanguinistas for this reason). The doors of the Emperor's Palace are locked for the duration of this festival, allowing no-one in or out.
Quests concerning Sanguine are bound to the Imperial Arena.
Very popular in Nibenay. The Vaernimite Cult has a stranglehold on the trade in legal narcotics: shops, boats and market stalls run by Vaernimites can be found in every Nibenese city, selling any kind of drug imaginable: ground-up mangrove roots, nerve-poisoning make-up, masks coated with drugs, marsh-honey extract, river newt glands, hallucinogenic pictures, etc. The only thing forbidden to them is Moon Sugar and its derivatives, though Imperial opposition to these is more a matter of custom and a suppression of the Khajiit - there are things a thousand times worse on the Nibenese market.
The main shrine of Vaernima lies along the Niben. Any gondolier can bring you there. The shrine has become a popular pilgrimage site for those plagued by nightmares to beg for a cure, or for thrill-seekers to try the most expensive and intricate mixtures of the Vaernimite masters. A small village has grown around the shrine, catering to the desires of these people.
A distinctly unpopular Prince. Several decades ago, Dagon had several cults to his name, usually dedicated to his aspects of ambition and energy. Even high-ranking Imperial functionaries were part of these cults. After the Imperial Simulacra, however, it became apparent that Dagon had conspired with Jagar Tharn, supplying him with the means to bring the Empire down. In the aftermath of this scandal, Dagonites were targeted indiscriminately, their shrines were destroyed, and most cultists were executed or sent to the prisons in Black Marsh.
Recently, a new Dagonite cult has grown popular: the enigmatic Mythic Dawn society under the leadership of the charismatic Mankar Camoran. This cult has gained followers in cities across the Empire. The cult is tolerated by the Empire: Blades spies have infiltrated it, and found nothing amiss.