When I was younger, I was watching a cartoon with a young princess, a prince and an elder guiding them. All I can still remember is that in an episode the elder was tying knots on a string, but I forgot the meaning of it. There were also some battles with Seth and stuff like that... and I know it's not "Prince of Egypt", it's a cartoon series, probably made in 2000, I don't know for sure. I'm guessing the period 1998-2002.