1839: British seize Aden.
1954: BP refinery at Little Aden.
1956: SAS sent to Aden.
1962: North: UK supports royalists.
1963: Aden: struggle against British.
1964-1967: Aden: Britain brutally fights liberation.
1967: Aden becomes South Yemen.
1970: North: British backed rebels sign a peace treaty.
1971: South: crackdown on dissidents.
1972 & 1979: Clashes between North and South.
1986: South: political violence.
1990: North and South unite. Yemen opposes US-led war in Iraq.
1994: Internal conflict.
1995: Clash with Eritrea.
2000: Attacks on US vessel and UK embassy.
2001: Relations with US.
2005: Revolt in north.