fifteenthˈ (or /fifˈ/) adjective

1. Last of fifteen
2. Next after the fourteenth
3. Equal to one of fifteen equal parts

1. A fifteenth part
2. A person or thing in fifteenth position
3. A double octave (music)
4. An organ stop sounding two octaves above the basic pitch

fifteenthˈly adverb

the Fifteen

The Jacobite rebellion of 1715