Miklós was born on April 8th, 1824. Miklós' father was Mihály Körtvélyessy and his mother was Katalin Juhász. His paternal grandparents were Körtvélyessy and Markovics. He had three brothers and a sister, named Mihály, János, György and Mária. He was the youngest of the five children. He died at the age of 50 on November 17th, 1874.