It is Kallyr who became Prince of Sartar in 1625, not Argrath (yet).
Although I get that the older starting point is an interesting and rich setting, the new one kind of appeals more to me right now, with a new scenario opening, the Empire repelled (for now), and lots of adventure sites, old battlefields, abandoned fortresses, etc... Plus the events of just a few years in the future.
But again, not gonna play any time soon, so will settle for just reading the books and have a good time. Sounds like readying history and legend and I love that.