An interesting conundrum for all of you Golarion continuity obsessives to consider:
According to Sargava, the Lost Colony, construction began on the future site of Eleder in 4138.
Yet, in the Acts of Iomedae (described in The Sixfold Trial), her second miraculous act was to free Eledar from a coven of Garundi witches.
Here's where the problem lies:
The Acts depict miraculous events during the time when Iomedae was a mortal servant of Aroden. According to the Campaign Setting, Iomedae would ascend to godhood in 3832.
Hence, nearly three hundred years before Eleder is founded, Iomedae frees the city from Garundi witches.
I've been giving this some thought, and a few possibilities occurred to me that could resolve this issue:
1. The city of Eleder itself was not freed by Iomedae, but the city's future site (and the M'Wangi people who inhabited the area) was, in the 3800s, visited by Iomedae. So, what the Acts actually mean is, "The future site of the city of Eleder was where Iomedae defeated the Garundi witches."
I find this the least compelling argument, personally, as it lacks any real drama.
2. The text in Sargava, the Lost Colony is viewing the issue from the viewpoint of Cheliax, as there was a preexisting civilization where Eleder now stands. The name Eleder cold refer to an earlier location or people that Iomedae freed, i.e. "Iomedae freed the tribe Eleder" or "Iomedae freed the city of Eleder". In this case, the naming of the city is inspired by the Acts.
This option begs the question, of course, what happened to the original people of Eleder? Did some great calamity fall upon the city, and there are yet-undiscovered dungeons beneath the current Sargavan capital? Was the colonization of Sargava such a brutal affair that the original people of Eleder were stamped out? Or, as an unforeseen consequence of Iomedae's liberation of Eleder, social order collapsed and the people of the area factionalized into the various tribes that we know of today, like post-Tito Yugoslavia?
3. The Acts were not compiled during Iomedae's lifetime, and were only written after the founding of Sargava in 4138. Existing as a series of oral traditions before this point, the miracle stories of Iomedae evolved over time to reflect the current concerns of the Chelish people. When they were finally codified into canon, there was bound to be some discrepancies.
This may seem absurd, but it does have some real-life parallels. Modern Biblical scholarship indicates that the Gospels were not written until decades after the death of Jesus and were compiled from third-hand accounts of parables and miracle stories. These oral traditions were collected and organized into narrative formats, leading to a number of discrepancies between the various accounts, such as the chronology of Jesus' travels, his exact genealogy, and (more simply) the number of angels that appeared to Mary after his death.
Although 300+ years is a long time to maintain oral traditions for the church of Iomedae, it seems unlikely that she had an extensive following before Aroden's death. Not only did Aroden have a more expansive portfolio, but the relative youth of her religion means that it probably spread fairly slowly. Also, a certain percentage of Taldor's empire (at this time being the dominant political force in Avistan) would feel uncomfortable worshiping a Cheliaxian goddess who did enjoy the "purity" of Azlanti origins due to her Ulfen blood. This seems even more likely when you consider that political tensions between Taldor and Cheliax were probably on the rise, as the Even-Tongued Conquest would occur only two hundred years later, in 4079.
While she likely had a strong following in Lastwall, the after-effects of the Shining Crusade likely kept the budding nation very busy as they engaged in their unending war against the orcs of Belkzen, who would prove to be more resilient foes than Tar-Baphon himself. Iomedae's clerics are not exactly the scholarly types besides, as they're depicted as constantly on the move in search of injustice, which Golarion certainly has plenty of. Therefore, field training of the clergy could have been held in higher regard than cloistered study.
During the compiling of these oral traditions into the Acts, there would likely be a lot of chaff to separate from the wheat, as the elder clergy debate which miracles are to be included and which are considered non-canonical. In the case of the Second Act, this relatively new story could have been selected for political reasons.
While religious faith often teaches us that scripture was passed down from the heavens, history indicates that these documents have an element of realpolitik as well. Concessions are made for the concerns of the day, and theology evolves over time to meet the needs of the faithful. From the transition of the ancient Israelite religion to Judaism with the destruction of the second temple to Mormonism's revision on their stance on polygamy, religions adapt or die.
Although Iomedae may despise those who use the "greater good" to justify wrongdoing, her emphasis on bringing "civilization" to savage peoples allows the clergy of Iomedae to endorse the colonization of Southern Garund. This endorsement would likely lead to larger donations to the coffers of her church, which would help fund the ongoing struggle in Belkzen and the cost of maintaining Lastwall's infrastructure. Further, through this endorsement of the creation of Sargava the Shield Knights would be essentially "buying a seat at the table". Clerics and paladins of Iomedae would be on the ground in Sargava to ensure that the most exploitative practices are stopped, and the clergy can also influence Cheliaxian policymakers to make just decisions thanks to their active involvement in the foundation of the colony.
If this seems out of character for a NG church, keep in mind that the Third Crusade of Mendev was used to justify the persecution of Sarkorian druidic culture and religion and the native Ioberian people of the region have been systematically brutalized by the Crusaders. Yet, despite these abuses, it is clear that no trials for war crimes are forthcoming, in part because of the "Blue Shield" that prevents Crusaders from turning on their own.
Thoughts?