Silly Question - If there were alleged sightings in 1552 and 1592, how come Sebald de Weerdt's sighting is undisputed ?

That wouldn't have been a silly question if Teribus had written 'undisputed first sighting', but since the phrase was 'first undisputed sighting'...

I had a fine time looking at some historical maps of Ireland on the web to see how much the area of land called Ulster differed across the centuries. There's hardly any geographic or regional name in the world that hasn't (1) changed over the times in what it referred to and (2) been used differently by different groups at the same time.

For us, 'Allemannen' are either a small subset of Germans or an ethnic group living in Germany, France and Switzerland, for the French 'Allemands' are all Germans. Macedonia is another example that comes to mind (a province in Greece, an own country, the idea of a larger area of land settled by Macedonians), Istria one more. Yes, we have them too, in Germany, at the extreme right fringe, those people who try to tell us that the word 'Germany' may not be used for the BRD, for historically...

Words for subsets of the world are used differently by differing people, it is a question of tolerance to allow other people their own words.

Wolfgang