Well, one part of it is that if a country knows you're not going to attack them, they're more likely to trade with you and help you out during a war. Also, many countries end up in alliances because they are all working towards the same cause, like defeating a particular country. So sometimes it's like an "the enemy of my enemy is my friend" kind of thing. Some times alliances are formed for protection, particularly by a young country or a smaller country. The best example I can give of this is from during and after the American Revolution, where the soon-to-be-United States of America formed an alliance with France so they both could take a jab at England. Hope this helps!
He was put under the spell of a love potion.
On the day of the feast of the Lupercal, Caesar walks among the people, receiving the glory from recent triumphs in battle. He lusts for power and has recently indicated his desire to be the emperor of Rome. There are many factions that do not want this kind of ruler.
Cassius encounters Brutus outside of the arena where the celebration is happening. Brutus appears troubled which seems the perfect time for Cassius to lay his plan before Brutus. He tells Brutus that he has been worried about him. Brutus answers that he is “at war with himself.”
When Brutus hears the crowd cheering, he states that he is afraid that they are offering Caesar the crown. This inspires Cassius to share his feelings with Brutus.
Cassius begins by flattering Brutus. He tells Brutus that he is as good as Caesar and a most honorable man. He then proceeds to explain what has happened to create in Cassius this hatred for Caesar.
A monarchy can rule until death, resigning, or being overthrown. Most are in the same bloodline for generations. An example would be the Tudors started with King Henry VII and ended with his granddaughter Elizabeth I. So this reign was only 3 generations.
