1203

1203 (MCCIII) was a common year starting on Wednesday of the Julian calendar, the 1203rd year of the Common Era (CE) and Anno Domini (AD) designations, the 203rd year of the 2nd millennium, the 3rd year of the 13th century, and the 4th year of the 1200s decade. As of the start of 1203, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.

Millennium:	2nd millennium
Centuries:	12th century – 13th century – 14th century
Decades:	1170s  1180s  1190s  – 1200s –  1210s  1220s  1230s
Years:	1200 1201 1202 – 1203 – 1204 1205 1206

1203 in other calendars

Gregorian calendar	1203 MCCIII
Ab urbe condita	1956
Armenian calendar	652 ԹՎ ՈԾԲ
Assyrian calendar	5953
Balinese saka calendar	1124–1125
Bengali calendar	610
Berber calendar	2153
English Regnal year	4 Joh. 1 – 5 Joh. 1
Buddhist calendar	1747
Burmese calendar	565
Byzantine calendar	6711–6712
Chinese calendar	壬戌年 (Water Dog) 3899 or 3839     — to — 癸亥年 (Water Pig) 3900 or 3840
Coptic calendar	919–920
Discordian calendar	2369
Ethiopian calendar	1195–1196
Hebrew calendar	4963–4964
Hindu calendars
- Vikram Samvat	1259–1260
- Shaka Samvat	1124–1125
- Kali Yuga	4303–4304
Holocene calendar	11203
Igbo calendar	203–204
Iranian calendar	581–582
Islamic calendar	599–600
Japanese calendar	Kennin 3 (建仁３年)
Javanese calendar	1111–1112
Julian calendar	1203 MCCIII
Korean calendar	3536
Minguo calendar	709 before ROC 民前709年
Nanakshahi calendar	−265
Thai solar calendar	1745–1746
Tibetan calendar	阳水狗年 (male Water-Dog) 1329 or 948 or 176     — to — 阴水猪年 (female Water-Pig) 1330 or 949 or 177

Events

• April 16 – Philip II of France enters Rouen, leading to the eventual unification of Normandy and France.
• April 8 – Congress in Bilino Polje, where Ban Kulin officially declared his allegiance to the Roman Catholic Church and denounced the heresy.
• June 23 – Fleet of the Fourth Crusade enters Bosphorus.
• July 17 – Fourth Crusade captures Constantinople by assault; the Byzantine emperor Alexius III flees from his capital into exile.
• August 1 – Fourth Crusade elevates Alexius IV as Byzantine emperor, after the citizens of Constantinople proclaim as emperor Isaac II Angelus (Alexius IV's father).
• Unknown - John, Duke of Normandy gives the Ecrehos to the Abbey of Val-Richer.

Heads of states

• France – Philippe II, Auguste King of France (reigned from 1180 to 1223)