Empathy is important in our digitized and polarized world and an important aspect of education. What contribution can history teachers make to develop this in their students? In this study we investigated whether a lesson unit making use of eyewitnesses and designed from six pedagogical principles, resulted in more confidence in the ability to empathize, attributed importance to empathy and understanding of empathy by 10th grade students. In addition, we investigated the differences between two conditions: the use of a guest (...) speaker versus eyewitnesses in a documentary. In this quasi-experimental intervention study, we used a pretest-posttest-follow-up design. The data were collected via questionnaires containing closed and open questions. The results showed that students (N = 97) in both conditions gained confidence in their ability to empathize and improved their ability to explain what empathy means and why it is important. After two months, progress on these items was still significant. In the condition with the guest speaker students scored significantly higher on understanding empathy than students who participated in the lesson unit with the documentary. This study contributes to the understanding of developing empathy through the use of eyewitnesses in history classes and the measurement of students’ understanding of empathy. (shrink)