From “A Brief History of Europe” by Snorri Eriksson
Stoicism in Post-Roman Europe syncretized heavily with the old Germanic and Roman religions. In the traditional Germanic worldview, three afterlives existed; the halls of Valhalla for the chosen slain of the god Odin, the goddess Freya’s hall Folkvangr for all the others who died in battle, and the frozen wastes of Niflhel for everyone else. Under the new Stoic worldview, those who lived virtuous lives would live forever with Freda in Folkvangr upon death, those who died defending the Stoic faith would go to live with Odin in Valhalla, and those who did not live virtuous lives would be damned to Niflhel with the goddess Hel. Within this new cosmology, the gods themselves gained new roles. For example, Hel went from simply being the ruler of the dead to being charged with punishing those who did not live according to the Stoic virtues. She was not seen as evil, but rather simply being charged with an unpleasant job and dutifully doing it. Later on in European history, she became charged with punishing sinners[1] in this life as well as the next and eventually as a personification of justice. Freya was likewise recast with her new role as ruler of the virtuous dead. Over time, she became solely an afterlife goddess and lost her original aspects as a fertility goddess, which were transferred to her brother Freyr. She came to be imagined as a motherly figure who would welcome the dead into the afterlife.
Other gods were also recast with the advent of Stoicism. For example, Odin was reimagined as a Stoic sage, for as a god of knowledge, it would only make sense for him to have knowledge of the Stoic virtues. As a result, myths where he did unsavory things were either said to have occurred before gaining knowledge of Stoic philosophy or simply transferred to other gods. It also became a prevalent question to what extent the Stoic virtues applied to the gods. It came to be the accepted view that even the gods had to accept Stoicism and follow virtue. Thus, Zeno of Citium, as the first teacher of Stoicism, was logically elevated above even the gods[2]. It was not uncommon for Stoic sages to enter the temples of the gods and recite Stoic scripture in Gothic to the idols within. In particular, Thor was the one god “preached to“ above all others. After the Gothic conquest of Rome, Thor became heavily syncretized with the Roman Jupiter, who was imagined as a serial philanderer and even rapist who fathered a veritable army of bastards. These myths were transferred to Thor, and thus he was deemed the one god least receptive to Stoic teaching.
Another god who was in need of learning Stoicism was the trickster Loki, with role in causing chaos made him naturally antithetical to Stoic virtues. However, he was also sometimes imagined as bringing about misfortune on the non-virtuous. Other gods, however, became increasingly lionized. For example, Tyr was reimagined as an exemplar of Stoic virtue, specifically the martial code followed by the warrior-aristocracy. Tyr lived by the principles of duty and honor unto death, and was admired and frequently prayed to by the aristocratic and warrior classes(of which there was significant overlap). If Tyr was a paragon of virtue as it applied to the warrior aristocracy, than Freyr was likewise for the peasantry. His role as a god of agriculture and fertility made him perhaps the most important god to the peasants. Of the gods, the Æsir became associated with the aristocracy and the Vanir with the peasantry. The original Germanic class system of jarls, karls, and thralls became codified over time. The jarls were the landed nobility, the karls were the artisans and craftsmen who lived in the city, and the thralls worked the jarl’s fields. Two new social classes would also develop; the Tiwazmen[3], or warriors for hire who served under jarls[4], and Stoic sages. Europe had changed greatly, and would continue to do so in the future.
[1]”Sinners” here simply meaning someone who doesn’t live according to virtue and acts according to their impulses. The term “passions” would make more sense than “sin” in a Stoic context, but that word has its own connotations in English so I’m using “sin” as the closest equivalent term.
[2]Think of the Buddha’s position in relation to the gods in Buddhism
[3]From “Tiwaz”, the Gothic name for Tyr. I use Norse names in here because I’m most familiar with them and because this was written by a Scandinavian writer ITTL, but it should be noted that Gothic is the lingua franca of Europe and in most cases Gothic rather than Norse names would be used
[4]They’re a bit more akin to Japanese samurai than European knights IOTL