Rennhi And Others

 

In Poul Anderson's The Technic Civilization Saga, Volume I, The Van Rijn Method:

"The Saturn Game" is a third person narrative with no viewpoint character;

"Wings of Victory" is a first person narrative with its narrator mostly off-stage;

"The Problem of Pain" is a third person account of Peter Berg's encounter with Ythrians on Gray/Avalon framed by a first person description by an unnamed character of his subsequent conversations with Berg on Lucifer.

Hloch's Earth Book Introduction to "The Problem of Pain" explains how the Solar Commonwealth had emerged from many Terrestrial nations but also refers to the then current Terran Empire, thus concertinaing centuries of Technic History.

The first person narrator of the framing passages in "The Problem of Pain" had written his account in a private correspondence preserved by the recipient's Terrestrial heirs and copied by a visiting historian. Rennhi, author of The Sky Book Of Stormgate, found that copy in the archives of the University of Fleurville on Esperance and her son, Hloch, included the account in the Earth Book. 

Thus, the list of Technic historians now includes the unnamed author of a private correspondence, the unnamed historian who copied that correspondence and Rennhi.