[17. THE TOWER OF LONDON. PART I.]
Dominate: to lord over, to overawe, to be master of. (Latin dominus, a master, lord.)
Crusade: an expedition under the banner of the Cross to recover the Holy Land from the Turks. Richard I. went on the third Crusade in 1191.
antiquaries: people who study ancient things.
mediæval: made during the middle ages; the period, roughly speaking, between the time of the Romans and the reign of Henry VII. (400-1485).
lieutenant: an officer in command of the Tower.
keep: the strongest part of a fortress or castle.
insignia: the badges of any office.