Ten Martyrs

The Ten Martyrs (Hebrew: עשרת הרוגי מלכות‎‎ Aseret Harugei Malchut) were ten rabbis living during the era of the Mishnah who were martyred by the Romans in the period after the destruction of the second Temple. Although all ten could not have been killed at the same time, since two of the rabbis listed lived well before the other eight, they are listed together, in a manner of a dramatic poem (known as the Eleh Ezkera) recited on two important Jewish holidays, to elicit the proper mood of the day, one of reflection and the hope of redemption in the face of attacks to the beliefs of Judaism.

The term "martyrology" is also used about the story of the deaths (martyrdom) of several famous Rabbis (including Rabbi Akiva) by Romans, read both on Yom Kippur and Tisha b'Av. Popular imagination seized upon this episode in Jewish history and embellished it with various legends relating the virtues of the martyrs and the fortitude shown by them during their execution. These legends became in the geonic period the subject of a special midrash—the Midrash 'Asarah Haruge Malkut, or Midrash Eleh Ezkerah. The deaths are described as being gruesome, including allegedly being wrapped in Torah scrolls and then being set aflame. See also Midrash Eleh Ezkerah.

The rabbis mentioned lived over a period of several hundred years and their stories are presented as a plot by Romans and others to weaken Jews by destroying Jewish leadership.

In the story, the Roman emperor Hadrian decides to martyr 10 rabbis as 'punishment' for the 10 brothers listed in the Torah who sold their brother Joseph to Ancient Egypt (Genesis 37). He justifies this by saying that the penalty for this was death. (According to Jewish law, one who kidnaps his fellow Jew and sells him into slavery is punished with death. This, however, does not allow for descendants to be punished in place of their ancestors.) Though this crime took place almost two thousand years earlier, there are 'none like you' 10 who are capable of rectifying this crime.

...
Wikipedia