Travertine was one of the three types of stone the Romans used for construction. The others were tuff and peperino.
I guess you are referring to the 2nd century BC rather than AD. Travertine is a lime stone which is harder than volcanic stones and takes a strong edge and sharper edge far better. Its quarrying probably started in the 2nd century BC and until the 1st century BC it was used selectively. Then it was used as a substitute for white marble in public buildings. It came in use for pavings, steps, door frames, springers of arches, stone corbels, keystones and well heads. Travertine was expensive. It was used for highest quality work and the use of volcanic stone continued. The Romans called it lapis Tiburitinus (stone of tibur) because it was quarried at Tibur (modern Tivoli) 30 km northeast of Rome.
Originally the Romans used only tuff, the local volcanic stone, for construction. Then they also used peperino stone. It is harder and more compact than tuff and although it is harder to work, it weathers better.I t was used for the outer face of buildings (the inside part was in tuff). In the 4th century BC it was used in the for statues and other stone artifacts. From the 2nd century BC it was used as a high quality stone for construction. The Romans called the peperino quarried in the Alban Hills area (20 km southeast of Rome) lapis Albanus (Alban stone) and the peperino from Gabii (16 Km east of Rome) Lapis Gabinus.
the centuries before you were born
During the 12 Century BCE - the year is unknown.
The second and third century churches began using instruments.
Tradition places it in the early 12th Century BCE
That story and the rest of the Greek myths are age old, nobody knows how old. They were first put in writing by authors Homer and Hesiod in the 8th century BC.
the Romans begin in 753 BC
the 22nd century will begin in 2100.
The Romans found it.
Science begin in the 16th or the 17th century about 1600's
the 22nd century will begin in 2100.
8th century.
the 11th century
they invent in on a cave...
20'th century.
The 18th century 1700-1800
The sixteenth century.
The 18th century 1700-1800