In Venice, Galileo learns of the "Dutch perspective glass", at the time the name for the telescope, and it's ability to make distant objects look larger. He immediately invented his first telescope despite having never seen one before and only having access to basic descriptions of Hans Lippershey's design. Galileo claims to have created his first telescope the day after hearing of the device. He then spent several days improving it. He went on to present this design to the public and doge Leonardo Donato. As a result, he was settled into his lectureship at Padua and had his salary doubled. The image below is a painting by H. J. Detouche and is of Galileo presenting his telescope to the doge. It is from Wikimedia commons and is public domain.