Ten generals - one from each tribe - were appointed to lead the army. They were often given directions by the Assembly to to implement decisions by the Assembly, as they were appointed on merit, rather than randomly by lot as were the 500 council members.
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It gave all power to the adult male citizens who met fortnightly in assembly to make laws and direct a council to carry out its wishes.
Greece was a collection of hundreds of independent city-states. So there was no Greek assembly to make laws for Greece - each city made its own. For those states which had a democratic or quasi-democratic constitution, citizens would meet at a designated place which varied from a paddock to a square to a specific assembly arena, depending on the city and period.
A major accomplishment of the Cleisthenes was that as before ,all the male citizens could participate in the assembly and vote on laws. Assembly members could now discuss issues freely, hear legal and appoint army officals.
When it became a radical democracy the (adult male) citizens met in fortnightly assembly and made decisions which were implemented by the Council. The citizens also formed the law courts - there were no judges or lawyers.
At first, Rome was a monarchy. When the last king was expelled in 510 BCE two consuls were elected each year to be religious and war leaders. Lesser magistrates (Praetors) were responsible for governing the city and for law. A Senate was established to provide the legislative base. There were two assemblies of the citizens - the Centuriate Assembly of all men entitled to bear arms, which decided all matters of war and peace, and a Tribal Assembly which elected magistrates. Later there was a Plebeian Assembly of all citizens who were not Patricians. It could put forward laws and elected 10 Tribunes of the Plebs each year, which continuously diluted a Senate dominated by Patricians. This Assembly was the vehicle which gave the Plebeians an increasing share of power. After the civil wars of the 1st Century BCE, Octavian Augustus set up a system to stop ambitious generals blackmailing the government with their armies. He made himself First Citizen, and although the Senate was retained, he kept control of the army and had the ability to introduce and veto laws. This we call the Principate (Princeps = First Citizen). This lasted until the late 2nd Century CE, after which the First Citizens became openly autocratic, and we call this later period as the Dominate. The term Emperor did not exist (an Imperator was a general who was given that title by acclaim of the army on the battlefield after a good victory). We use it today to describe the head of an empire.