The new Shah , unlike his father , was initially a mild leader and at times indecisive .
Reza Shah 's 22 - year - old son , Mohammad Reza Pahlavi , became the Shah of Iran .
The new Reza Shah , unlike Reza Shah 's father , was initially a Reza Shah leader and at times indecisive .
Reza Shah 's 22 - year - old son , Mohammad Reza Pahlavi , became the Shah of Iran .