Eldest is written by Christopher Paolini
[Human]: Could you recommend something similar to the book Eldest? [Assistant]: Sure, Christopher Paolini wrote the Eldest and the book The Inheritance Cycle and The Bellmaker are similar. [Human]: The Inheritance Cycle sounds good, do you know when that was released? [Assistant]: Yes It was released in 2011.  [Human]: Oh, okay sounds like it is newer than The Eldest then. Sounds perfect. 
Actually, The Inheritance Cycle was written before Eldest. It was released in 2005 while Eldest was released in 2008.