What do you mean by successful?

Arguably, the Stonewall Riots were successful. The riots happened following intense police brutality towards LGBT, encroaching on the clubs where they could be themselves. The rioters (who were mostly drag queens and street kids) managed to overwhelm the police and the riots were very widely publicized. The aftermath of the riot saw many LGBT activists group forming as well as the birth of the pride parade a year later. 4 years later, homosexuality was removed from the American Psychiatric Association as a mental illness.

Something to keep in mind off is that prior to Stonewall, LGBT activists groups were focused on presenting LGBT people as a "normal" member of society. When Frank Kameney (an activist) marched in front of the white house in 1964, his aim was to try to convince the public that LGBT people were the same as those working in the white house. Demonstrations were not violent - e.g. the sip in at Julius bar in which the activists identified themselves as homosexuals before ordering a drink. After Stonewall, Kameney (and other activists such as Randy Wicker) cited the violent nature of the riot as the catalyst for gay liberation. The act of standing up against their oppressors (and succeeding) lead people to realize that gay liberation was possible, that they weren't helpless. At Stonewall, the lack of police reinforcements meant that the rioters managed to locked the police in the club - reversing the role of oppressors and oppressed.

One last thing - I think it is reductive to say that Stonewall was the birth of gay pride or that it marked the beginning of LGBT acceptance/tolerance. Violent riots at Cooper Donuts and the Black Cat Tavern took place before Stonewall but because of the lack of publicity, they were not as effective as Stonewall. It's also important to note that prior to Stonewall, there were many homophile groups such as the Mattachine Society which promoted gay rights and provided a sense of acceptance for gay men. The Mattachine Society has been widely criticized as being too conservative both pre and post Stonewall.

Stonewall wasn't the first riot - it is merely one event (albeit one very successful event) in a very long chain that paved the way for gay acceptance today.

It depends on your definition of success. Spartacus was terribly successful during the Third Servile War, from some points off view. He defeated two consular armies before he went up against armies led by two future triumvirs.

The rebellion led to a mass execution of the rebels, so you could call it a failure. But, they were very successful in that they severely depleted Republican Rome's military, which allowed the triumvirate that better represented slaves' interests to take over with little resistance. They also caused attitudes to shift for the better amongst Romans, according to Suetonius. Romans were fearful of slave revolts and had experienced them before (hence, third servile war), but the fear in this case led to reforms such as making killing a slave murder and encouraging manumission.

The Irish were a minority in the UK-owned British Isles, but I'm not sure if that's what you're asking since they were a majority in their own lands. Greece is a similar example.

You might also look at the more hands-off colonization efforts. Many powerful countries put minorities in power. Sunnis in Iraq, Alawites in Syria, Tutsis in Rwanda, etc.