In this case? They don't. Here's the most complete original version of the story I can find.

The sensational headline skips over a key part of the story: "The analysis of the monument revealed that it was the burial chamber of a great hunnic leader, most likely that of King Attila himself[...] In fact, this definitely seems to be the resting place of the almighty Attila, but further analysis needs to be done to confirm it."

It's pretty simple (usually) to tell if a tomb is for an important person or not: general size and decoration, amount/style of grave goods, etc. in comparison to those around it. So really the title should read: "Tomb of Hunnic Leader Found: Atilla's the Only One Most People Have Heard of So It's Probably His"

But that assumes this article is legit. I doubt it is. First off, it directly quotes Wikipedia. "a feast celebrating his latest marriage to the beautiful and young Ildico" is not even paraphrased from the article on him. Second, poor writing abounds. Words like "knowned" and "an historian" shouldn't slip past into your article. Third, I don't think this Albrecht Rümschtein exists. Search his name, and you get nothing but reiterations of the article. I can't even find him on Evotos Lorand University's page. (note that it's written wrong in the article)