Development of PE

Main

5000 BC
Approx. 776 BC
Approx. 1814 AD
1823 AD
12 Nov 1885

Subpoint 1

776 BC
Approx. 1500
1823 AD
1826
2 Nov 1910

Subpoint 2

1825 AD
1826
1834
2 November 1972

Subpoint 3

1810
1823 AD
1858
1 January 1990

Subpoint 4

1861 AD
1891