Playing for your country is the pinnacle of any players' career.
Even one-cap wonders look back on their shortlived international careers fondly, despite the fact their achievements are forgotten by the majority of fans.
But those who go on to wear their nation's shirt for a record number of times tend to be well remembered by their legions of fans.
However, even household names can be difficult to recall when you're put on the spot.
So, with the new UEFA Nations League about to get underway, can you name the most-capped player for each of Fifa's top 20 national teams?
It's not easy easy as it sounds.