By Jesse Moeller
Answer: ELIZABETH

Each picture clues the name of a specific monarch or ruler whose name has a number associated with it, e.g. RICHARD I. The numbers underneath the pictures give the centuries of these rulers’ reigns. Indexing into the regnal name with the regnal number gives GLORIANA OR LILIBET, which are nicknames for ELIZABETHs I and II respectively, leading to the answer, ELIZABETH.

Rulers in order:

Ruler name Extracted letter
MAGNUS III BARNLOCK G
MICHAEL VII MINUS A QUARTER L
DONALD II THE MADMAN O
ROBERT I THE BRUCE R
DAVID IV THE BUILDER I
MICHAEL V THE CAULKER A
NAPOLEON I THE LITTLE CORPORAL N
BASIL II THE BULGAR-SLAYER A
OLAF I HUNGER O
RICHARD I THE LIONHEART R
BOLESLAW III THE WRYMOUTH L
ERIC III THE LAMB I
VLAD II THE DRAGON L
NICHOLAS II THE BLOODY I
ABDULLAH II THE WARRIOR KING B
EDWARD I THE HAMMER OF THE SCOTS E
OTTO II THE RED T