Centuries: 2nd century - 3rd century - 4th century
Decades: 200s 210s 220s 230s 240s - 250s - 260s 270s 280s 290s 300s
Years: 247 248 249 250 251 - 252 - 253 254 255 256 257
... as well as a variety of intermediate positions.
The respective efficacy of these rules depends on the social position of the group that develops them, on its ...
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