He appeared to be too young for an effective ruler.
He was the effective ruler of Cambodia from 1953 to 1970.
As the effective ruler of Japan, he oversaw sweeping economic, political and social changes.
He proved himself a ruthless and effective ruler in the Caucasus.
His father was old and senile, leaving himself as the effective ruler of Naples.
Only recently has Louis been reappraised as an effective ruler in his own right.
For many years in the 19th century he was the effective ruler of Bonny.
She was regarded as an effective and popular ruler.
It is the mid-1920's, near the end of the period when warlords were the effective rulers of China.
The transnationals were at this point the effective rulers of Mars.