if this isn't a trick question, i say 9.
There was no second group of three rulers in Rome.
with three 11 inch rulers
Three
the moon is the closest to the earth
the moon is the closest to the earth
Lepidus
At three decimal places it is closest to 1.150 and no other number.
the moon is the closest to the earth
This is a garbled version of the word triumvirate, meaning a group of three, especially three rulers.
Polaris is the closest of the three stars.
0.3
The Sun is the closest star. Next closest are the three stars of the Alpha Centauri system, of which the closest is Proxima Centauri.