The entry for the "Helvidia Gens" in the Dictionary of Greek and Roman Biography and Mythology was written by the dictionary's editor-in-chief, Sir William Smith himself. [1, 2]

How the Authorship is Determined

• The No-Initials Rule: In the prefatory guidelines of the dictionary, it is explicitly outlined that any biographical or historical entry that does not have initials appended to the end of the text is the work of the editor, William Smith. [1, 2]
• The Helvidia Entry: The brief entry for the Helvidia Gens (found in Volume II, page 380) lacks any contributor initials, thus confirming Smith as the direct author. [1, 2, 3]

If you are researching this specific Roman family, would you like me to compile the historical details Smithprovided about them, or map out the genealogy of its most famous member, the Stoic philosopher Helvidius Priscus? [1, 2]