Ordinal numbers
Just add -th to the cardinal numbe
four - fourth
eleven - eleventh
When expressed as figures, the last two letters of the written word are added to the ordinal number
first = 1st
second = 2nd
third = 3rd
fourth = 4th
Exceptions
one - first
two - second
three - third
five - fifth
twelve - twelfth
Titles
Charles II - Charles the Second
Edward VI - Edward the Sixth