What were Plato's views on tyrants and democracy?

Plato disapproved of democracy because he thought it wasn't right to have many men without knowledge of his metaphysical concept of the forms ruling a state as they would be unaware of wha is truly good for the people. He wanted a philosopher king to provide for the common good. He believed that democracy always going to lead to tyranny as once the state had finished it's 'drunken pleasure cruise' it would look to a strong leader, 1930s and 1940s Germany could be seen as an example of this.