Does "the later Rubicon" mean "now-nonexistent Rubicon River"?

Context:

of the same order of improbability. One-off events like this might
be explained by the anthropic principle, along the following lines.
There are billions of planets that have developed life at the level of
bacteria, but only a fraction of these life forms ever made it across
the gap to something like the eucaryotic cell. And of these, a yet
smaller fraction managed to cross the later Rubicon to consciousness.
If both of these are one-off events, we are not dealing with a ubiquitous
and all-pervading process, as we are with ordinary, run-of-the-
mill biological adaptation. The anthropic principle states that,
since we are alive, eucaryotic and conscious, our planet has to be