Riding the 15-year-old High Kingdom, owned by Gleadhill House Stud Ltd, this will mark Zara’s seventh ride at the Lincolnshire four-star event. She last competed here in 2011 on High Kingdom, finishing in 10th place.
This entry comes after the partnership were left off the list of British eventers selected for the Olympic Games in Rio.
Zara’s best result at Burghley came at her first attempt in 2003 on Toytown, when she finished second to Pippa Funnell. When Zara had a fence down in the showjumping, she handed the Burghley title and the first ever Rolex Grand Slam of eventing title to Pippa.
High Kingdom is also entered for the British Open eventing championships at the Festival of British Eventing, Gatcombe (5-7 August), which is likely to serve as a final prep run for Burghley.
Other notable entries for this year’s Burghley include Australia’s Chris Burton riding Nobilis 18 and TS Jamaimo, who was third at the 2015 running of the event.
Fellow Australian Sam Griffiths is entered on his super-consistent four-star partner Happy Times, who has been in the top 20 at Burghley five times.
Andrew Hoy is entered on Rutherglen and The Blue Frontier, and will be trying to emulate his winning performances on Moonfleet in 2004 and Davey in 1979.
Paul Tapner aims to improve on his best Burghley result of seventh place on Inonothing in 2009, on the 11-year-old mare Vanir Kamira, who makes her third four-star appearance.
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There are a number of four-star first-timers and first-time Burghley riders who have already entered.
Of the 16 four-star entries so far (entries opened on 1 July and close on 29 July), 50% of them will be making their Burghley debuts.
These include Matthew Glentworth (Ultimatt), Elisabeth Halliday-Sharp (HHS Cooley), Libby Head (Sir Rockstar), Tony Kennedy (Westeria Lane), Leah Langg-Gluscic (AP Prime), Giovanni Ugolotti (Oplitas) and Becky Woolven (Charlton Down Riverdance).