• 1721 crimes in Europe‎ (1 P)

/

• 1721 disestablishments in Europe‎ (3 C, 2 P)
• 1721 establishments in Europe‎ (14 C, 2 P)

D

• 1721 in Denmark‎ (1 C, 2 P)

E

• 1721 in England‎ (1 C, 2 P)

F

• 1721 in Finland‎ (1 P)
• 1721 in France‎ (2 C, 1 P)

G

• 1721 in Great Britain‎ (6 C, 4 P)
• Great Northern War‎ (3 C, 24 P)

H

• 1721 in the Habsburg monarchy‎ (1 C)
• 1721 in the Holy Roman Empire‎ (1 C)

I

• 1721 in Ireland‎ (1 C, 1 P)
• 1721 in Italy‎ (3 C)

K

• 1721 in the Kingdom of Sicily‎ (2 C)

M

• 1721 in Malta‎ (1 C)

N

• 1721 in Norway‎ (1 P)

P

• 1721 in the Papal States‎ (1 C, 1 P)
• 1721 in the Polish–Lithuanian Commonwealth‎ (1 C)
• 1721 in Prussia‎ (1 C)

R

• 1721 in Russia‎ (2 C, 3 P)

S

• 1721 in Scotland‎ (1 C, 3 P)
• 1721 in Spain‎ (2 C, 1 P)
• 1721 in Sweden‎ (3 C, 3 P)

0–9

• 1721 in Great Britain
• 1721 in Russia
• 1721 in Wales

D

• 1721 in Denmark

F

• 1721 in France

G

• Great Northern War

I

• 1721 in Ireland

S

• 1721 in Scotland