Well, whatever phenomena made survivors, it seems the case of the Romanov claimants has become the most well known. There were other claimants in other countries in other times of various royals, but they aren't as well known. When I first read of there being survivors of things in royal history, besides the Romanov claimants, I was surprised. I think the fact of the Romanov claimants happening in the modern age really helped get the word out as it were.Thus, I think the fact of survivors like the Romanov claimants is not made by authors, but encouraged, although the primary motives of these claimants lie elsewhere than publicity.