i think i have already stated how the greek sources indicate seleucid giving up his daughter and territory in exchange for war elephants. He wont receive those gifts if it was the other way around.I did not ask for a source about a marital alliance between Seleucids and Mauryas. Everyone is already agreed on that point, as Strabo and Appian explicitly mention it. I asked for a source for Seleucus offering his daughter to Chandragupta. In what source is that mentioned?