To establish the ownership history of a manuscript, you need to do archival research in auction catalogues and library catalogues and lists of bookplates and stamps. This history will usually have gaps, because ownership is not a physical property of an object which leaves indelible traces, but a social agreement. People steal books and manuscripts, people sell books and manuscripts which don’t belong to them, people forge evidence that a book or manuscript belonged to someone famous, and people burn the records of grandpa’s used books business to tidy up after his death. Its hard to track the ownership of Greek manuscripts during the fifteenth century for the same reason its hard to track the ownership of antiquities during the 1940s. And if you are using a manuscript to understand the ancient world, the ownership history is not really important. Let me explain.
Since 1805, combat between well-equipped air and naval forces has become rarer and rarer. This is because states which can produce such forces have little to gain from fighting one another, and because it has become harder and harder to sustain such forces at all. In the 19th century, the Royal Navy was usually overwhelmingly superior to everyone else (although the French and the United States sometimes gave it a run for its money). Since the 1950s, the US air force has had a similar advantage over everyone else’s. Small states look at these navies and air forces, decide they can never defeat them, and either stop bothering with their own navies and air forces, or side with one of the big powers, or hide in harbour or in neutral countries when war approaches (the fleet-in-being strategy). Big states do some spectacularly stupid and thoughtless things, but rarely something as stupid as getting into a war with their allies or a nuclear power, and pretty much all the states with sophisticated air forces and navies are either each other’s allies or nuclear powers.
This means that stories about how a future naval or air war would go are fantasies based on speculation and imagination and peacetime tests, not observation and experience of actual warfare.
A few weeks ago, I talked about how an identity is something to which someone says “I am that.” After a series of unfortunate events between 1914 and 1948, educated people stopped talking about race, gender, and ethnicity as essences and started to talk about them as identities or social categories. This change was meant to reduce the amount of murder, enslavement, and forced migration in our world. But when we try to understand the ancient world, identities in the proper sense are not very helpful.