Saif al-Islam, a son of deposed Libyan leader Muammar Gaddafi, appeared in court on Thursday in the town of Zintan, where he had been held since his capture by former rebels in November 2011. Saif al-Islam, at the center of a legal tussle between Libya and the International Criminal Court (ICC), smiled and told reporters he was in good health during his brief appearance. The powerful armed group in Zintan, which spearheaded the capture of Tripoli from Gaddafi's forces in August 2011, has insisted on keeping Saif al-Islam imprisoned in the town, about 140 km (90 miles) southwest of the Libyan capital. Once Gaddafi's presumed heir, Saif al-Islam is wanted by the ICC on war crimes charges, but the case to be heard in Zintan relates to charges that he gave information to an ICC lawyer last year that could endanger national security. He was the only defendant of 13 people who were called to appear in court on those charges, confirming he was in the room when his name was called out and that his lawyers were present. The case was then postponed until September 19 because the defense's case was incomplete. The ICC lawyer, Australian Melinda Taylor, was herself detained for three weeks after a meeting in which Saif al-Islam is accused of handing over sensitive papers and information. Taylor, who had been appointed by the ICC to act as Saif al-Islam's defense lawyer, has said her detention proved he could not get a fair trial in Libya. "These documents as I understand it were nothing more than Saif expressing a preference to be tried by the ICC," said John Jones, the lawyer appointed by Saif al-Islam's family to defend him before the international court. He added that the national security charges Saif al-Islam faced were "the antithesis of justice," and said Libyan authorities had violated his right to speak to a defense lawyer by seizing the documents and detaining Taylor. ICC lawyers also note that he could face the death penalty if convicted in the North African state - an outcome that would be welcome to many Libyans who suffered under Gaddafi's 42-year rule and in the revolt that toppled him.