When he was grown, Zeus forced his father to vomit up his siblings, who rebelled against the Titans. Zeus released the Cyclopes and Hecatoncheires, who became his allies. While the Hundred-Handed Giants fought alongside Zeus and his siblings, the Cyclopes gave Zeus his great weapon, the thunderbolt, with the aid of which he was eventually able to overthrow the Titans, establishing himself as the ruler of the cosmos. Homer
In Book 9 of the Odyssey, Odysseus describes to his hosts the Phaeacians his encounter with the Cyclops Polyphemus. Having just left the land of the Lotus-eaters, Odysseus says "Thence we sailed on, grieved at heart, and we came to the land of the Cyclopes". Homer had already (Book 6) described the Cyclopes as "men overweening in pride who plundered [their neighbors the Phaeacians] continually", driving the Phaeacians from their home. In Book 9, Homer gives a more detailed description of the Cyclopes as:

an overweening and lawless folk, who, trusting in the immortal gods, plant nothing with their hands nor plough; but all these things spring up for them without sowing or ploughing, wheat, and barley, and vines, which bear the rich clusters of wine, and the rain of Zeus gives them increase. Neither assemblies for council have they, nor appointed laws, but they dwell on the peaks of lofty mountains in hollow caves, and each one is lawgiver to his children and his wives, and they reck nothing one of another.
The latter occurrence is particularly difficult to diagnose early, as abdominal pain and ileus paralyticus are considered normal in people who have just undergone abdominal surgery. In most cases of perforation of a hollow viscus, mixed bacteria are isolated; the most common agents include Gram-negative bacilli (e.g., Escherichia coli) and anaerobic bacteria (e.g., Bacteroides fragilis). Fecal peritonitis results from the presence of faeces in the peritoneal cavity. It can result from abdominal trauma and occurs if the large bowel is perforated during surgery. Disruption of the peritoneum, even in the absence of perforation of a hollow viscus, may also cause infection simply by letting micro-organisms into the peritoneal cavity. Examples include trauma, surgical wound, continuous ambulatory peritoneal dialysis, and intra-peritoneal chemotherapy. Again, in most cases, mixed bacteria are isolated; the most common agents include cutaneous species such as Staphylococcus aureus, and coagulase-negative staphylococci, but many others are possible, including fungi such as Candida. Spontaneous bacterial peritonitis (SBP) is a peculiar form of peritonitis occurring in the absence of an obvious source of contamination. It occurs in people with ascites, including children. Intra-peritoneal dialysis predisposes to peritoneal infection (sometimes named "primary peritonitis" in this context). Systemic infections (such as tuberculosis) may rarely have a peritoneal localisation. Pelvic inflammatory disease

Non-infection
Leakage of sterile body fluids into the peritoneum, such as blood (e.g., endometriosis, blunt abdominal trauma), gastric juice (e.g., peptic ulcer, gastric carcinoma), bile (e.g., liver biopsy), urine (pelvic trauma), menstruum (e.g., salpingitis), pancreatic juice (pancreatitis), or even the contents of a ruptured dermoid cyst.