Witnesses will begin giving evidence in the Family Court bombings trial in July with former firefighter Leonard John Warwick having pleaded not guilty to a string of attacks and murders in the 1980s.
Warwick denies committing four murders - including the shooting deaths of his brother-in-law and a judge - and 20 other offences.
His crimes involved extreme and targeted violence following a long-running Family Court dispute, crown prosecutor Ken McKay said in his opening address in the case on Tuesday.
Warwick, 71, is charged with the bombing of Justice Richard Gee's home and of the Family Court building in Parramatta in 1984; and, in the same year, the bombing of the home of Justice Ray Watson in which his wife Pearl was killed.
Warwick's ex-wife's solicitor was allegedly the target of a car bomb.
In 1985 he allegedly set off a bomb that ripped apart a Jehovah's Witnesses hall, killing Graham Wyke and injuring 13 people, part of the congregation offering support to his ex-wife Andrea Blanchard.
In his brief defence opening on Tuesday, lawyer Alan Conolly described his client as "a lover not a murderer". He said the crown evidence was "flimsy".
The judge-only trial in the NSW Supreme Court will resume on July 9.