Which preposition to use with toure

in Occurrences 1%

You would be at some loss to recognise now the truth of old Leland's description of that once stout and gallant bulwark of the north, when "he numbrid 11 or 12 toures in the walles of the Castel, and one very fayre beside in the second area."

of Occurrences 1%

I dyd take my lycence For to travayle to the toure of Chyvalry; For al my minde, wyth percyng influence, Was sette upon the most fayre lady La Bell Pucell, so muche ententyfly, That every daye I dyd thinke fyftene, Tyl I agayne had her swete person sene.[101]

Which preposition to use with  toure