Tracing the roots of the piano to the very beginning of consciousness, when man first became aware of sound.
C. 3rd Millennium BCE, Harp

The harp appeared throughout the Middle East and Egypt, and moved widely across the world, in both vertical and horizontal modes. Considered to be the first stringed instrument, the speaking length of its various strings created a harmonic curve that would dictate the shape of the piano’s frame.
Page Sources
SOURCES
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[1]
Pergien. "The God Ra-Horakhty." Painting. Original in the Louvre, Paris. Commons Wikimedia. Wikimedia Foundation, Inc., 6 April 2007. Web. 5 Oct. 2015. Public Domain.
Additional References:
- Lawergren, Bo. "Ancient Harps." Oxford Music Online. Oxford University Press, 2007 – 2015. Web. 14 Sept. 2015.