Regarding the second explananda, I'd also suggest an interesting article by Fergus Millar (who also doesn't buy the clientela theory of late Roman politics): Millar, F. (1973). Triumvirate and principate. JRS, 50-67. Millar provides a very close reading of the primary source materials (letters to officials, inscriptions, etc) that reveal which powers Octavian had during the establishment of the monarchy.
The basic thesis is that the traditional powers of the republic provided guidance for Octavian when he was in the uncharted legal waters of the triumvirate. Thus, it was the basic republican institutions rather than clientela which provided Octavian with the bridge to the principate.
Restraint is a virtue . :blowup:
With regards to?