You don't have to look far to find people congratulating Rangers after winning their first league title in a decade.
Everyone from Graeme Souness to Triple H have been in touch to pat Steven Gerrard and his team on the back, after Celtic's draw with Dundee United officially ended ten years of Ibrox misery.
Among the more obscure messages of support, though, was one shared by Rangers' official Twitter on Tuesday.
Dobrin Gyonov, CEO of Bulgarian club FC CSKA 1948 Sofia, signed a letter to the club congratulating them on their 55th league title.
In a heartfelt message, Gyonov draws comparisons between Rangers' story and their own, having experienced a similar rags to riches story on their way up from the Bulgarian third tier.
"We such as you start from the lowest football tier in the country to walk the path to the top with honour and pride," it reads. "And now seeing you celebrating this incredible triumph we are definitely full of excitement and joy!
"You inspire us to write a new golden page in the history of CSKA as a member of the Bulgarian League after all that has happened with our favourite legendary club."
But who actually are CSKA 1948? Let's have a look.
Who are FC CSKA Sofia?
The recent history of football in Sofia is fairly complicated. In short, there are two CSKA Sofias, and each claim to be the original.
The story started back in 2016 when the unified, undisputed CSKA Sofia was banished to the third tier for financial mismanagement. They soon declared bankrupt, and ceased to exist.
That gave birth to CSKA-Sofia (note the hyphen) who were founded immediately after, and admitted straight into the top flight. That club now operates under the same name, and present themselves as exactly the same club as the one who folded.
But some at CSKA were unhappy with the quick road to the top, and soon formed their own club - CSKA 1948 - who claim that they are the original CSKA.
The two faced off for the first time ever back in August. CSKA-Sofia are currently second in the Bulgarian League, and CSKA 1948 sit sixth, after their promotion from the second tier last season.
To make matters even more confusing, there are two other clubs from Sofia - Levski and Slavia - who compete in the same division.
To be clear, it's CSKA 1948, the new boys in the top flight, who have been in touch with Rangers.
What are the Rangers parallels?
Chairman Gyonov and the other founding members of the club essentially view CSKA-Sofia as an elitist parody of the original club.
They see themselves as the definitive version, and stake a claim to all the history and honours of the original club, including 31 league titles and two European Cup semi-finals.
From their perspective, then, Rangers' story is an exact mirror of theirs - a club banished from the lower leagues only to steadily work their way back into the big time.
CSKA 1948 won the South-West Third League (tier 3) at the first time of asking in 2017-18, and took two attempts to get out of the Second League, eventually winning it last season.
Their top flight debut hasn't gone exactly to plan, but they have ambitions of challenging for silverware in the seasons ahead.
That explains why they idolise Rangers' title win. It's taken as a source of inspiration and a sign of what they can achieve.
