Centuries: 5th century - 6th century - 7th century
Decades: 500s - 510s - 520s - 530s - 540s - 550s - 560s - 570s - 580s - 590s - 600s
Years: 550 551 552 553 554 555 556 557 558 559 560
Events and Trends
Wikipedia (http://en.wikipedia.org/wiki/Main_Page)
550s (http://en.wikipedia.org/wiki/550s)
version history (http://en.wikipedia.org/w/index.php?title=550s&action=history)
GNU Free Documentation Lizenz (http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License)
CC-by-sa (http://creativecommons.org/licenses/by-sa/2.5/)
