What is the function of CI here?

What's in the foreground?

Girl History on Instagram: "Lucrezia Borgia was born into one of the most notorious families of Renaissance Italy. As the daughter of Pope Alexander VI and sister to Cesare Borgia, her life was tied to power and scandal from the start. She was married off three times for political gain, with several of her husbands meeting suspicious ends. Rivals accused her of incest and claimed she carried a poison ring, though much of this was likely rumor. Yet she wasn’t just a pawn—at twenty-two she governe