Google for "PMN Caecilia". You might want to look for free fonts similar to PMN Caecilia, as the latter is not for free.
Back-in-history: I meant that I would like to have a "back" function (through a dedicated physical button or a sw menu) to go back to the previous reading point. This feature is useful when visiting footnotes in ebooks, and you want to go back to the text you were previously reading. (It can be achieved with a suitable back-link in the ebook, but not all the publishers do their job well...). This feature might also be used as "up in the hierarchy" when using menus or browsing the library.