Other Considerations

120 to 127 AD
Roman engineers and soldiers build Hadrian's Wall in 122 to protect Britain from northern tribes

140 to 149 AD
Ptolemy (Claudius Ptolemaeus), b about 100 AD writes Megale syntaxis tes astronomias (Arab Translation: Almagest); it becomes the most important text on astronomy during the Middle Ages

170 to 179 AD
Roman physician and anatomist Galen of Pergamum (Turkey), b about 130, becomes the first to use the pulse as a diagnostic aid

180 to 189 AD
Galen compiles in his writings all medical knowledge that exists at time in one systematic treatment; this compilation will be used until the end of the Middle Ages

The first writings on alchemy appear in Egypt