What are some examples of selflessness?

Throughout history there have been many acts of selflessness. While some of these acts are subjectively selfless, some resonate in most people's hearts as tremendous acts of bravery where one person sacrificed his own safety for the well-being of a group.

brutus overlooks that the majority of the crowd served julius caesar the military general. he appeals to their citizenship as romans by calling them first by that name in his salutation: "romans, countrymen, lovers." mark antony, however, speaks in terms understood by the military, by calling them first by, "friends, romans, countrymen." he recalls not only caesar the general but caesar the friend, whose body they see covered with stab wounds.