Few can resist taking pictures of “The King of Adams Morgan.” (Clif Reeder)

The Internet has Grumpy Cat; D.C. has Romo.

The effortlessly cool Adams Morgan bull mastiff/pit bull mix is famous in his neighborhood — and well beyond — for hanging out the window of his owner’s Calvert Street NW rowhouse, serenely observing the world go by.

Known to fans as “The King of Adams Morgan,” Romo has been featured in a book of must-photograph D.C. sites and at least one couple’s engagement photos.

So when WTOP reported Wednesday that Romo’s owners are moving in search of greener pastures in Arlington, saddened locals took to Twitter to mourn.