I want to know the answer to the following question:
Who also established this retinue as well?
All the background I'm provided with is that "Mieszko I of Poland (c. 935 – 25 May 992) established an elite knightly retinue from within his army, which he depended upon for success in uniting the Lekhitic tribes and preserving the unity of his state.". Is that enough to answer the question?
Answer: no