Tolkien had more than one concept for Amroth. Clear is, that he took up the kingship when in the last aliance the Woodland-king of Lorien died.
These King was in the first concept Magdalen and was Amroth and Celeborns father. Thus Celeborn was the rightfull King as long as Amroth didn't return. Amroth return was not completly out of question since none in Middle-Earth had seen him die. In an other concept Amroth was the son of Galadriel and Celeborn. And in a thrid one he was the son of the Woodland King then named Amdír who was unconected to Celeborn (or better only remotly akin).
When Amroth went to the south with his beloved Nimrodel, to led her into Valinor he had already left Lórien and searched Nimrodel for some time so that he didn't had a chance to give the kingship over to whom ever. In the cases of concept two and three neither Celeborn nor Galadriel were in Lórien when Amroth left it. They only went their when they heared of Amroth's depature.
Respectfully
Findegil
|