I thought I would just give you the unchanged original as it appears on the Trajan column without constructing or putting a "philosophy" behind the letters. Unfortunately, because of stupid graffiti tourists, the modern Romans had to surround the column with heavy duty iron bars. I could not trace the lettering directly, so I had to rely on my photographs. In order to make it usable for today, I added Small caps, numerals and all the diacritical marks even Yen and Euro signs. I designed a complete set without changing the original appearance.
The Romans were heavy users of ligatures so I added all the ligatures I could find (capitals only). To top things off, I added a "relief" capital letters alphabet for use as initials. It has got the same spacing as the smallcaps alphabet, so you can produce a two tone effect by overlaying the relief over the normal capitals. Your very imperial Gert Wiescher