Centuries: 2nd century - 3rd century - 4th century
Decades: 200s 210s 220s 230s 240s - 250s - 260s 270s 280s 290s 300s
Years: 248 249 250 251 252 - 253 - 254 255 256 257 258
... to study the country's educational system. His autobiography (see below) was published in English translation as recently as in 1995.
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