It was known as natural philosophy until the late 19th century.

After this little is known about the abbey and the city until the 19th century.

Although part of the Roman world, we know very little about the island until the 11th century.

Earth history is well known to us until the 21st century.

It was not known until the 20th century what these writings were.

Physics was known as natural philosophy until the late 18th century.

Little is known of this until the 17th century when the Church was upgraded.

The real answer was not known until the 20th century.

Not much is known about the history until the 18th century.

Very little is known about the ownership from the 1870s until early the last century.