Quote Originally Posted by Peasant Phill
- You can't retrain your king, but he'll replenish his unit on his own. So, unfortionatly you can't tech up your king ones he is crowned.

- You can retrain your heir but be careful with that. If the old king dies when the heir is in the retraining cue, it is very likely that the game crashes in some way.
On the first note, if you're heir isn't teched up at the time he is crowned, since as the heir is crowned in the most advanced province you have, he may be auto-teched by the game. So, if you're heir comes of age in a province with just a Fort...he won't have many upgrades going for him. But if he is crowned in a province with the Master Armourer and a Metalsmith, and hasn't been teched up to those levels yet, he'll be granted them instantly.

And on the second note...sometimes I've encountered CTD issues with retraining non-heir units, but I don't know what causes it. Of course, the one time it was an heir, my king died very soon after as it was...something very strange happening in the process. I decided to remove my prince from the retrain queue, but I did it in the review panel, not the recruitmen/retrain panel, and the next unit, a FMAA...it got a strange name, like 'King Roman Numerals ###' or something...took that guy out, put him back in, and wham! CTD...

Don't forget that retraining may also add morale to the unit you're retraining - I think, anyway. I hope! LOL!