First off there are only 3 official total war games STW MTW and RTW. MTW:VI is just MTW with the viking invasion expansion pack. Also Alexander the greats time is about 50 years before RTW starts and Hannibal and Gaius Julius Caesar times are included in RTW's time frame. It's easy to get a family member named Hannibal for Carthage, within the first 2 generations usually. For Caesar, you need a Julii family member named Gaius Caesar, then you turn him into a kickass general and statesman.