Centuries: 6th century - 7th century - 8th century
Decades: 580s 590s 600s 610s 620s - 630s - 640s 650s 660s 670s 680s
Years: 634 635 636 637 638 - 639 - 640 641 642 643 644
Births
Deaths
... - 3rd century - 4th century Decades: 190s 200s 210s 220s 230s - 240s - 250s 260s 270s 280s 290s Years: 237 238 239 240 241 - 242 - 243 244 245 246 ...