The melting point of a solid is the temperature at which it changes state from solid to liquid. When considered as the temperature of the reverse change, the temperature is referred to as the freezing point. For example, the melting point of mercury (element) is 234.32 Kelvin (-37.89 °F)
... designated anyone who assumed power for any period of time without a legitimate basis of authority.
The first to have the title of "Tyrant" was Pisistratus in 560 ...