Alegreya is an open-source serif typeface designed by Juan Pablo del Peral. It was chosen by ATypI as one of 53 “Fonts of the Decade” at the Letter.2 competition — an impressive accomplishment for a font that is available for free. I rarely see Alegreya used on the web, which is surprising because in my opinion it is one of the absolute best fonts available on Google Fonts.
If you are looking for an alternative to Alegreya, I recommend checking out Lapture and Jude. I think Avenir would make a nice font combination paired with it.