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Spell out first century through tenth century; then use figures.

second century
the late 18th century
a tenth-century B.C. vase
late 18th-century chair

11th-century architecture
mid-17th century
mid-17th-century architecture
Note: 1801 (not 1800) through 1900 is the 19th century.

Be careful when using the term turn of the century that the meaning is clear. The turn of the century from the perspective of 2006 would be the change from the 20th to 21st century.

See also DATES.