Since the disbanding of the Sanhedrin (Jewish court of sages) some 1600 years ago because of persecutions, Judaism hasn't been centralized. Each community has its Rabbi(s).
In the past, there were the kings for national leadership, and the prophets and sages for Torah-teaching and guidance.
King Solomon.
Yes the Zulu King was the most powerful one
King Saul
powerful king of all = מלך רב־עצמה של הכל (melch rav atsma shel ha kol)
King Philip II (1527 - 1598) is generally considered to be the most powerful Habsburg King of Spain.
King Solomon is Isreal's most powerful of the Israerli kings!
Theseus is the most powerful character in "A midsummer night's dream"
The Queen would be the most powerful piece in Chess whereas the most important chess piece would be the King .
Gupta dynasty became most powerful during the rule of king samudragupta .
King Kamehameha was the greatest king in Hawai'i.
mansa musa
the king and the government